Adjust Payment Module and some cart features - Easy & Quick

Our website is fully built and fully functioning. We are using the interspire shopping cart. Everything is built in and just about all of the code is prewritten. Please see a live version of the admin at: [login to view URL] You will do the following: Make it possible for the customer to never leave the page when submitting their payment details. This function is supposed to be already built into intersperse module. This task is supposed to involve some very small manipulation to code that is already written. Make it possible for customers to set orders they want every day or week... and automatically process the order at the set time. Set up a way to make all items I sell to be sold by pound, each or by individual. Ease level: These tasks are rather simple especially because most of the stuff is already coded. You are essentially changing lines of code here and there Time frame: 2 days. I am willing to relax this deadline slightly. However, the payment module should be fixed within this time period Payment: I have had some very bad experiences with freelancers on freelancer.com. I do not want some one who will hold this project hostage and waste my time. Please bid if you are serious and ready to start work IMMEDIATELY. I will prefer bidders who ask for small milestone payments. Those bidders who ask for no milestones will automatically be awarded this project. DONOT bid a price higher than $50. This price is fixed. I may however give you extra if you work hard once the project is complete.