Add / Modify Discount Rules Interspire Shopping cart

Interspire Shopping Cart - We need to add more discount rules to Interspire Shopping Cart (v.6) Current available rules are Order Based Rules: Buy X items get free shipping Free shipping on orders over X$ Get an X$ discount on orders of Y$ or more X$ discount for repeat customers X% discount for repeat customers Product Based Rules: Buy one get one free Buy one get something else free Get X% off all items in one or more categories We need to add current extra rules 1) buy one item in a category at MSRP (not price) (if they only buy 1 item they will pay list price, 25% off MSRP. Example: DVD is at 10.00 MSRP, it will be selling for 7.50. if they buy second dvd, at checkout they will pay 10.00 and receive 2 DVDs (Save 5 dollars) get another in same category free, 2) buy volume 1(item 1) at MSRP, get another one 60% (or some percent off). if only one is purchased it is sold at price, not msrp.