In command prompt there is TAB completition, so you don't need to write exact file names. For example you are in LFS directory and you write L, hit TAB and viola first file starting with that string appear -> LFS.exe

So I'd like to have something similar in LFS, for example I start writing /ban F, then hit TAB, and /ban Flame CZE appear (if he is on server, or any other user/player starting with F) and then ofcourse I add 999 to end of command

Better idea might be that if you were an Admin, and you clicked on someone's name from the connection list, it gave a list of choices, such as;

<nickname>

Talk
Send Setup
Spec
Kick
Ban

and if you choose Ban it gives you choice of time (12hrs, 1 day, 999 days, etc.)

I second the above idea, would also work for implementing a PM system!