To make an official gamepack, you need the GMAX SDK and a license. This costs $$,$$$
Plugins like the one for BF2 or any non official gamepack, were most done in maxscript which anyone can learn and do. They just had better knowledge then must GMAX users to know what to look for as infos to export/import.
You best bet to learn how to create your own is to first learn maxscript and then either examine already existing scripts to see how they did it or go and visit the sites where those plugins came from.
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