I finished the next version. It is located at:
http://www.goldnose.com/files/heaviesvsscouts.smxAny changes to team composition are made instantly.
Trade has been fixed up to prevent a minor error with over-enthusiastic spectators.
Resupplies are now operational and seem to have no real impact on game performance. (The event listener can't know who got resupplied so the plugin has to check everybody's weapons whenever someone gets resupplied.)
There is now the option to prohibit Sandmans and Nataschas. The default is to disallow them. In addition there is an option to allow scouts to carry Bonk Atomic Punch or Crit-a-Cola. The default for that is to allow that.
Unfortunately, I could not get the autoscramble in.
Oh, and new convars:
hvs_sandman 0
hvs_natascha 0
hvs_drink 1