First of all, I like what you're doing here. I always liked GTA II, being my first GTA game. It's nice to see it on the GTA SA Engine.
Anywho, in the "KNOWN BUGS IN CURRENT RELEASE, " the last note:
Using the Pay'n'Sprays or buying weapons at Ammunation with under the required cash deducts your funds into negatives rather than rejecting the purchase
That is not really a bug... After your gambling level reaches maximum, you can go upto $1, 00, 00 into the negatives. Believe me, the casinos hate it when you go into the negatives. I had people pulling up and trying to kill me every time I left the airport until I got back into the positives.