CodeIgniter/ExpressionEngine Plugin Customization

Our ExpressionEngine website currently has two plugins used for our members to purchase tickets to events on our website: MoreEvents and the shopping cart CartThrob as our gateway. MoreEvents support has been slow and a new version seems unlikely to be released so we’re looking for some custom modifications. We love how MoreEvents has an inline tab that lets authors add pricing and ticket numbers right from the Channel Entry publish page but we want more options added. We also have a version of CartThrob running to handle orders so you can use its API to get the desired results or cut development time. Our changes to MoreEvents: The ability to change the # of tickets each user can buy per event. Currently, you cannot change the # of tickets each user can buy for each event without coding it via HTML on a template which is irritating. We usually let users buy 1 or 2 tickets (an additional ticket for a guest). We need to be able change this according to each event without hardcoding the HTML. After users buy the # of allotted tickets, they should be disabled from buying anymore tickets for that particular event but able to buy tickets from other events. Exporting our attendees to an Excel sheet has been problematic. Problem: MoreEvents lists every single post in the channel and they are unsortable. We need to exclude entries with no ticket sales, able to sort with our most current entry on the top or alphabetically. We want to automatically collect a member’s username (which is their first name, last name) automatically and only collect a second guest name when the two ticket option is enabled. We shouldn’t have to have users input their names since we already have them and do not want users to able to buy discounted tickets on behalf of others. We’d like to try to get the checkout process to be as streamlined. A one-page checkout before kicking out to PayPal would be ideal. Adding coupons from CartThrob to apply to events postings. So if we create a coupon in CartThrob we would like it apply to our event prices. MoreEvents is not exporting members to the CSV who are manually added to the backend and has been known to skip adding members who have paid for not particular reason. We'd like to fix this bug permanently. If interested, we have the plugins available and would be setting up a dummy site for test. After the project is verified as working, we'll import the new plugin files to our live site.