You can't really 'add' new units to the game... BUT, you can use some of the hero slots and turn them into more useful units. I mean, was there ever any use for Tassadar/Zeratul (Archon)? How about Magellan? Sarah Kerrigan? Tassadar? Fenix? They're dead now; use them. To make them buildable though, you're going to have to do some button editing, using StarGraft and MemGraft. If you look around on this website you'll find tutorials for StarGraft and MemGraft, most likely. Actually, just wait a few more minutes and DTBattlecruiser will pop in here and link them for you.
Oh, and if you want to add new graphics for these new units, use graphics no one likes like Overmind (Cocoon), or some of the unused ones, like Venom (Unused Zerg Attack).
QUOTE(Ermac @ Jun 26 2006, 03:20 PM)
About SCMloader, i dunno haven't really tried it yet..
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Neither have I.