Adjustments & Additions to JigoShop

I require the following Adjustments & Additions to JigoShop: 1. Remove Billing Address section (I want to use offsite payment) 2. Remove requirement to complete shipping address during checkout (I usually sell digital goods) 3. I already use Custom Payment Gateway plugin. Depending on cost, I still need to add between 1 and 3 manual payment options, like existing Bank Transfer or Cash on Delivery options. I need to give each new payment option a name (like existing Method Title) and payment instructions (like existing Customer Message, although would be good to have different lines/paragraphs like Bank Transfer). I need ability to change name and instructions when needed, like existing options. 4. Show payment option name (i.e. Method Title) & payment instructions (i.e. Customer Message) in confirmation email which is sent to both customer & myself. 5. If I rename Cheque Payment, Bank Transfer or Cash on Delivery options, Whatever is typed in Method Title must show in emails as payment option selected. I hope this is possible within my budget. Many thanks.