There were a lot of hacks and editors to SC BW that allowed people to make interesting map features that changed the game (some permanently).
I know that the SC2 galaxy editor has much more potential and there are many many gimmicks to be discovered that could be even more interesting. I would like to compile a list of all those gimmicks and even suggestions for new things to try out in sc2 maps.
I don't think there is a comprehensive list of this anywhere. I can't remember everything, but I will add to this OP whatever I missed that you guys come up with (its helpful to list a map that uses the gimmick as well).
[b]Island/Hybrid Map Specific Gimmicks:[/b]
[*]Mineral walls that mine out later in the game to turn into a land map.
[*]Strictly island (no building outside bases) map.
[*]Plateau maps (can build outside bases after drop), and/or low ground is all connected.
[*]3-4 start location maps that have at least 2 spots connected by ground, and the remaining being individual island.
[*]Low count mineral blocks to stop terran CC floating imbalance. (although this would have to be changed to 30+ because of orbital SCV loading and mules)
[*]Regular land map with Island expansions.
[*]Stacked destructible walls. (need splash units to destroy simultaneously)
[*]In base Expansions.
[*]Small mains with small choke outside naturals.
[*]Pattern/doodad cloning/repeating. (aesthetic only)
[*]Neutral high armor/hp unit walls.
[*]No ramp main.
[*]LoS Blocker main.
[*]In base Xel Naga towers. (can be used in conjunction with previous)
[*]Creep patterning/Webbing. (Also allows faster spread).
[*]Neutral creep tumors/creep colonies.
[*]Neutral buildings. (To help with walling or anti walling)
[*]Modified mineral/gas counts.
[*]Small unit only paths.
[*]Expansions with siege zones/drop platforms above.
[*]Low ground mains.
[*]Reverse style maps.
[*]Mixed; low and high yield resource bases.
[*]Neutral Assimilator pathways (Destroy them and the empty geysers create a wall. [BW only?])
[*]Non edged resources in mains. (Resources in middle of the base instead of against the edge of the map, wall, or cliff)
[*]Mineral or gas only bases.
[*]Neutral CC for infesting (BW only)
[*]Backdoor pathways to nat or main.
[*]Wide 3rd base on cliff with ramps above nat.
[*]Neutral cloaked unit walls.
[*]Pocket island expansion inside main.
[*]Even level ground on expansion/surrounding with a ditch or narrow wall around. (with or without LoS blocked)
[*]Far or unnatural nat. (Doesn't cover main)
[*]Ramped cliff surrounding main.
[*]Double main. (twice the resources without needing another HQ building)
[*]Permanent dark swarm.
[*]Permanent disruption web.
[*]Permanent forcefield. (can still be removed by massive unit)
[*]Permanent blinding cloud.
[*]Permanent time warp.
[*]Permanent guardian shield.
[*]Permanent point defense drone.
[*]C-Rocks to destroy buildings/watch towers (any building or object under 500hp that is immobile, otherwise it does 500 damage and the D-rocks do not appear).
[*]C-rocks to eliminate geysers or minerals from a map. (See [url=http://www.teamliquid.net/forum/viewmessage.php?topic_id=395769]interesting thread here.[/url])
[*]Domino style C-rocks to close large areas of the map. (all rocks in line take the same damage at the same time)
edit-Formatting didn't cross over well, sorry. Just check out the TL thread.