Disable skins command

Yes, it is possible to restrict certain weapons with the use of certain mods.

There is a mod out there that requires SDKHooks to use, but allows weapon disabling, including warm-up rounds.

Here's the mod: http://forums.alliedmods.net/showthread.php?p=950174

There are a couple of ways to accomplish this, namely editing config files. However, the easiest way is for you to use console commands once you are in a game to fill it however you like. You will start with a standard 5 vs 5 setup and by using the following commands you can then clear the server and fill it with the amount of bots you so desire.

1. bot_kick - This command will remove all bots from the game.
2. bot_quota # - By replacing the "#" with a number you will spawn in that amount of bots. Take into account that YOU are included in that number. For instance if you type "bot_quota 2" it will simply add 1 bot in addition to yourself.

You can find additional bot-related console commands HERE.