For the affiliates plugin, it would be very useful to have an itemized list of all the referrals of any given affiliate: subscription/signup referrals and actual orders. This may or may not be visible to the affiliate but it's definitely useful for the administrator as a sort of manual check that we can compare with.
PS. Do you have any set process in taking in 3rd party contributions? I'm a developer myself, with capacity to contribute, so I may end up writing some of my feature suggestions myself based on client requirements. Since the plugins are GPL, I'm required by license to contribute it back to the upstream.