Plugin Customisation - Marketpress/Events+

Background info: I have a site marketing online english lessons ([login to view URL]). My site is built in Wordpress, and the e-commerce functions are handled by a combination of the Marketpress, Appointments+, Events+, Cubepoints and Buddypress plugins. The system works but is a little clunky in places. I am looking to: 1) Configure Marketpress to shorten the checkout process. Currently, Marketpress has a five-step checkout process. This is redundant and user-unfriendly for my site, as I am selling digital products. I would like MP to be custom-coded to shorten the checkout process, ideally to one step. Currently: Purchase --> Review Cart --> Shipping --> Checkout --> Confirm --> Thank You Desired: Purchase --> Thank You 2) Configure Events+ to display the list of upcoming events in a way which is not included in the plugin (no easy way to explain this verbally, but it would require a little bit of custom CSS; I don't want anything wildly complicated), and also to shorten the booking process of events by one step. Currently (from events archive): book event --> confirm attendance --> pay --> checkout Desired: Book --> Confirm --> Checkout 3) Configure Appointments+ to cut one step from the booking process. Currently: Book --> Confirm --> Pay --> Checkout Desired: Book --> Confirm --> Checkout To summarise: currently, to book a class, users have to go through as many as eight or nine steps. I would like to customise the plugins to cut this down to two or three.