This isn't a suggestion to the GPS, but rather a suggestion for the site. Or maybe it already exists, and I haven't found or forgot about it.
Anyway, how about a site/thread/page maintained and only editable by the iFly staff with:
Current "ranking" of potential upgrades. Maybe an "A" list, "B" list, "Not Feasable", "Not Feasable at this time", etc. Another idea for this page would be links to forum discussions on each suggested feature or upgrade.
Wishes granted, upgrades accomplished. Sort of a brag list showing how much the iFly has improved over time.
This would also provide a place to check to see if an idea has already been suggested, its status, and links to current/past discussions on the topic.