Please. Pleasepleaseplease...
Whenever you (all of you grin ) zip something, make sure that it contains a folder where
the files are located.

This way they won´t produce a big mess in my download folder when I unpack them
by rightclick. wink

Sounds reasonable?

c_move(my,vector(5,0,0),nullvector,IGNORE_PASSABLE|GLIDE);

This will give heavy lag, due to the fact that the aliens try to solve there
blocking. Glide produces a lot of overhead.

They should stop moving after impact and they should go on when they have the room to move.

Also this one is suboptimal:
c_move(my,nullvector,vector(0,0,-c_trace(my.x, vector(my.x,my.y,my.z-2000),IGNORE_ME+IGNORE_SPRITES+IGNORE_MODELS+USE_BOX)),IGNORE_PASSABLE|GLIDE|IGNORE_PASSENTS);

It will pull down the enemy, regardless of its real distance to the ground.
Will result in lag and stucking.

no science involved