I'm not sure who is actually keeping this updated, seems perhaps "Mecha the Slag"
I have an idea, if it can be done.
When a plugin is being updated, can the cfg file that is made for the plugin being updated (cfg\sourcemod\customname.cfg) be renamed as such (cfg\sourcemod\customname.cfg.bkup) so the new cfg file can be made ?
This way if there are new cvars added to the plugin, they will be listed in the new cfg.
Also, and option to e-mail 1 or more admin's if a certain plugin was updated. This could be a reminder for the admin to re-edit the new cfg with the new cvars.