well, i personally use slackware, it's my biggest friend and enemy ;) just creeps me out sometimes but i love it when it's just functioning well

btw, wouldn't it be wiser if i would install all programs to folders which are shared? i mean like, if user1 installs everything in his home directory then user2 can't access the progs when he logs in

If user 1 was to install a program into his own home directory user 2 would have to be able to have ececuteable and probly read access as well. On top of that, user 2 would have to know where it was in order to execute it if it were not in the "path".