Playing Maps

[jiba]

Take notice that some maps are blocked in 1.1 (e.g TwinTowers, HeadshotCity, etc)
As long as I can remember, these are things that are blocked if the maps have the following:

• ceiling too high
  
• map too big
  
• pickups too close to each other (except health, and I think pistol clips?)
  
• flags too close to each other
  
• floor too low

Are there any other things that could be an issue, such as use of mapmodels?