Many RTS's have a mechanism that allows them to overcome certain terrain features in the late game. In more land based RTSs, there is high ground that is not traversable to unless utilizing a ramp. Usually, the RTS would then have a flying transport ship to overcome this terrain feature (the high ground).
Flops doesn't have the high-ground concept (kinda hard to in space), however, we do have blocking triggers, which serve much of the same purpose by creating inaccessible areas, choke points, etc.
I propose that Flops adds a mechanism to circumvent the blocking triggers in the "late" (relative term) game. Lore wise, there is the USS Pegasus's Phase-shifting cloak that would back this concept, so I suggest that the phase-cloak be this mechanism, and that it allows ships to pass through blocking triggers.
- Phase-cloaked vessels are all (normal) cloaked (i.e. detectable via normal (blue) Tachyon Ping), unless otherwise specified (see Borg).
- Vessels that are seen phase-cloaking and then fired upon have an exponentially increasing chance, starting at zero (0), of being hit and of being hit in the weapons system. Example: A ship that is in phase-cloak and detected and fired upon by the enemy will not take any damage the first volley (all fire will miss). The 2nd volley will have a 10% chance of hitting, the 3rd volley will have a 50% chance of hitting, then 90%, then 100% chance of hitting either hull (normal damage) or weapons (specifically).
- The weapons systems of a ship powers the phase-cloak or the phase cloak generator(the thing the exerts a phase-cloak field). A ship under the effect of an exerted phase-cloak field who's weapons are disabled is not 'phase-cloak-disabled' (won't become "stuck"). The phase-cloak exert-er would have to be destroyed or weapons taken off line to cease the phase-cloak field/effect.
- If the phase-cloak effect is disabled/no-longer-effecting a ship in a blocking trigger, the ship is becomes "stuck" (crew level goes to red, ship can not move or fire and lifesupport is disabled (flashing yellow, but not damanged) for 20 sec. Sensors are reduced to 1 (or whatever a 0 crew ship under one's control see's). Ship can transport)
- A ship with a personal phase-cloak (see Romulans), that are actively phase-cloaking and under the effect of a phase-cloak field or within the radius of a phase-cloak affected blocking trigger, whose weapons are diabled are not "stuck" - all phase-cloak effects or fields must be removed before a ship can get "stuck".
- Inversely, if a ship is "stuck" (perhaps "fused"?), and then later a phase-cloak field or effect is exerted upon it, it would become unstuck ("unfused"?).
Some race specifics:
Federation: A research-able special on a science ship (or a new science ship) that exerts a large phase-cloak field causing many nearby ships to phase-cloak. Upon research of the ability (or construction of phase-cloak-specific ship), a diplomatic penalty of -1 offense, -1 defense to all ships and stations is incurred.
Romulan: A research-able upgrade to Warbird cloaks (pre-requisite: Warbird advanced cloak) - each ship would have to upgrade their cloak individually. (think refits.. balance by cost of research and refits)
Klingon: A research-able upgrade for the BortaS allows it to refit itself to a phase-cloak weapon equiped version of itself. The upgraded/refitted BortaS keeps it Advanced Cloak, but gives up all other abilities for a phase-cloak generator. Because of the inefficiencies of Klingon technology, it takes two overlapping BortaS's phase-cloak fields to affect blocking triggers (allowing ships to pass through them). A single Klingon phase-cloak field will cause blocking triggers to glow red (no ship pass through). The overlapping Klingon phase-cloak fields will glow a deeper red (allowing ship pass through). Enemies can utilize the phased blocking triggers (i.e. enemies can pass through them). The phase-cloak field will drain the BortaS energy reserves from full to zero in 20 sec.
Borg :borg: : As Borg lack imagination, assimilation of a ship from a faction that, at time of assimilation, possess phase-cloak technology (they must have researched, purchased or otherwise "have" phase cloak then), enables the Diamond chassis to select a phase-cloak module (up to 3). This module would allow the Diamond to extend a phase-cloak field to nearby allied vessels. Additional modules increase the range of the phase-cloak. Because of the size of Borg vessels, Borg vessels do not fully cloak, and are therefore visible (albeit with a slight 'ghost' effect: same effect as seeing your own cloaked vessels) to all. Detected phase-cloak exponetial hit rates apply.
Dominion: An upgrade to the Dominion Hyper-space Sensor Station allows it to exert a phase-cloak field on a specific area of known space (i.e. have to have viewed area at some point in time). Effect lasts 10 seconds and guarantees at least 1 large blocking trigger radius/area of affected space (overlapping blocking triggers of the one targeted are also phase-cloak-circumventable for those 10 seconds). A visual effect is visible to allies, who can utilize the phase-cloak field. A visual effect is NOT visible to the enemy, but the enemy can utilize the phased blocking triggers (i.e. enemies can pass through them).
. Borg already have transwarp. I could imagine the Dominion to create an artificial wormhole to pass through asteroids. Klingons could get a weapon to simply shoot asteroids. 
cheeri-o 
