The official bug/issue tracking site for CS:S DM is here:
http://bugs.alliedmods.net/index.php?project=6
You can log in with your forums account (register on the forums in order to login if you don't have an account).
Please use this system for reporting bugs. You can still request features on the forums in order to discuss them first if you'd like. Otherwise, the forums should be mainly for support.