take a close look at the /includes/ directory, and you will have everything you need to suite your needs. all these files are like the default API classes for your needs. each file have the specific functions to answer specific needs in code integration.
no need of more extensions...
2¢CA == 1¢US... but btw, it's a cent
EDIT... btw, discussing the code structure of vB would have more values on vBulletin.com than here... we already code new things because we need more features, having them implemented in vB means you discuss with the coders of it, at vBulletin.com !
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