1.) You still need sv_cheats 1 for you to be able to use cheats. I think (not entirely sure) you need a plugin to allow admins to use cheats without enabling it for everyone.
3.) You can either change the default mapcycle file, or if you have created a separate one you need to add a line to your server.cfg
Code:
mapcyclefile <filename.txt>
To set another map as your default you need to add
+map koth_harvest_final to your startup command.