[Liam]

Weapon restrictions are cleared at the end of each map. So if you want a weapon restricted every map you'll need it in server.cfg for now.

ie.
sm_restrict awp
or
sm_restrict awp 2
or
sm_restrict awp 2 <team>

One of my 'todos' is to add in a weapons.cfg file that will execute each map change, and that will be added in sometime in the near future.

Now, insofar as current restrictions. No, there isn't any way to do that. I will make a note though and implement that at the same time I do the weapons.cfg.