if your not trying to setgrav all the time, and only on zoning, you can use a CFG file also.
This comes from the MQ2 site.
autoexec.cfg - Executed on the first pulse (when you reach character select, or when you are in game)
charselect.cfg - Executed when you reach character select
zoned.cfg - Executed after you finish zoning, but right before the map-specific config is executed
<server>_<character>.CFG - Executed when this character enters the world
<mapshortname>.CFG - Executed when you zone into this zone
<pluginname>-AutoExec.CFG - Executed when this plugin is loaded (after its initialization is complete)
Examples of file names:
tallon_lordsoth.cfg - character
oot.cfg, soldungb.cfg, soldunga.cfg, take.cfg - maps
MQ2Map-AutoExec.CFG,
MQ2ChatWnd-AutoExec.CFG - plugins