The random map generator is a little hard to work with on wall, gate and turret placement. I have put in many, many hours trying to get those things to place correctly in custom random maps for both AOK and now in SWBG. The way that gates are placed, for example, follows a formula that moves around the whole perimeter of the wall, and it is very common to get two gates forming a corner.
And the turrets (towers in AOK) are placed as a certain distance from your starting CC, but the calculation varies from side to side (it seems different N & S than E & W), so if you try to place the turrets closer to the walls, they often endup 1 tile outside the wall
The only way to really change those features would be to meddle with the game engine itself (which LA bought the rights to from Ensemble Studios), which I don't think they want to get into in a patch.
By the way, if you want to try out a really different, more advanced type of Fortress map, you should try out the one I created (a rms, not a scenario), called SuperFortress, which starts with a little better placement of the turrets and walls, and adds AA turrets, plus every type of military building, animal nursery, war center, and the whole base has power cores distributed about. It is great for RM or DM or Terminate the Commander games, though the computer AI does not play the best in RM ( because the forests are all outside of the walls and after taking advantage of the stored carbon bins in the base the AI kind of shuts down sometimes). It is available here: SWGB Heaven Downloads: Random Maps (
http://swgb.heavengames.com/downloads/list.php?type=Random) or here: Mr Fixit Online's SWGB RMS Downloads (
http://www.rtscentral.com/readPosting.asp?PostingId=654519)
By the way, this map has randomized terrains also, as do most of the ones I have posted at these sites.