I would highly recommend against using custom global load's especially in excess. If at all maybe a few race models, but you really run the risk of introducing client crashes.
Unpredictable client crashes come from loading in a bunch of models from zone to zone. The client doesn't handle confliction with models loaded from the local zones as well.
If you want to introduce custom races into zones, you can use the _chr.txt file generator I built here:
http://eoc.akkadius.com/EOC2/min.php...&GenRaceFile=1
And at the very minimum, be aware that this can cause crashes with conflictions in particular zones depending on what the zone demands to load.