Okay, sounds like you're sorted out with a solution. In the past, I've programmed extensions as "a block" for Moodle, but with the block display code just containing a link to a seperate PHP page in the block's directory. This page then includes the standard Moodle library files but doesn't call the print_header / print_footer functions, it simply does all page output itself. You might find this a handy way of having access to Moodle's facilities whilest basically producing a seperate piece of code. Sounds like your solution works alright, though!
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David Hicks
General developer forum
Using Session Cookie?
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