To be placed behind the vehicle you left (by pressing S), go into the sdemons.ini file and make the following change: PutSlewBehindVehicle=1.
To blow up all planes except yours, press ~ to open up a chat line and type in:
FS_LookAtTheSillyMonkey
First open a Chat Box with ~. Then type in:
FS_HaveACow
To drop a cow out of everyone's plane.
To make a limit to the maximum size of the on-disk texture cache, go into the sdemons.ini and type in TextureCacheLimit=x where X is a number in bytes for the maximum size of the on-disk texture. If the cache grows greater than this number, it will be cleared. The default size is 500 MB.