TotSC is an add-in. But even if it was an add-on, I'd install it before playing BG1, as it fixes a few bugs and adds some items (Scimitars!) to other parts of the game as well.
Achieving the XP-cap is the same as in BG2, you'll have to do a lot of the side quests to reach it. Although it's a bit easier, as you will more often have random encounters with monsters in BG1, and so gain some more XP.
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