1) You can put any names you want into a file called rb_names.txt in your realbot directory, it chooses random ones from that file. (/hlds_l/realbot/rb_names.txt under linux)

2) edit the file bots.cfg in your realbot directory. Just add those same lines and it will run them on map change.

3) Turn off Internet mode and they wont leave and come back I think, they will just always be there.

Hope this helps.