Looking for a client checking plugin

[inc0gs]

you might want to try the CAL server plugin; however, I don't know what variables it checks and locks. Otherwise, it might be possible to use Mattie's event scripts plugin, and create a custom script that looks for and keeps client variables at what ever you set them to.

CAL Server Plugin
Mattie's Plugins

Other than those two above, I don't know of anything that can do or might be able to do what you are looking for.