Do your toons wander where they are not supposed to?
Those who have toon wandering issues or whatnot - when you say "radius", what radius do you mean, modbot, melee, makecamp? There are actually three things that work together to make certain that your bots fight and return to a certain area - MQ2MoveUtils, MQ2Melee and the MB_charname.ini file (from ModBot).
/makecamp x x x
This is a MQ2MoveUtils setting that needs to be properly configured. For example:
/makecamp radius x leash=on (or something like that)
Please see the MQ2MoveUtils (PMS version) thread and MQ2MoveUtils:v11 for more detailed information.
/melee x x x
This is an MQ2Melee setting. Those ranges and settings come into play and must be set accordingly to work WITH modbot
Please see the MQ2Melee thread for more detailed information.
Modbot INI
Radius = the max the toon will "See" thiings
ACLeash = the max a toon will engage things
If you don't properly configure MQ2MoveUtils, MQ2Melee and ModBot and confirm those settings are within or compatible with ModBot "ranges" then you'll have issues.