To answer you:
1. You can access all you are supposed to access without editing any game files.
2. There is a hidden kit, but you can't use it till the expansion anyway.
3. You can go to
www.teambg.com and download the Bonus Shopkeepers override to give you the Dierdre and Joluv, the 2 bonus shopkeepers.
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Memnoch - Custodian of the Order of the Holy Flame 