[ConnorMcLeod]

Also, where is the place to set the cvar to 1 ?

I mean, you are resetting it to 0 on plugin_init, plugin_cfg is called 1sec after it, but amxx.cfg is randomùy executed from plugin_init and per maps configs are randomly executed like 6.1 sec after plugin_cfg.
So, per maps settings will fail.

I suggest to add a command instead of a cvar.

-edit-
For those 6 extra spawns, i remember haveing tried to alter classname and failed.