This isn't the place for feature requests, there is a message board for that called "Website Suggestions/Feedback" at the bottom of the page after clicking on the "Community" tab. There have been about a gazillion requests for Runkeeper sync support, I will link to the "master thread" for it, and it has some instructions on what you can do to help (survey on Runkeeper site)...

http://www.myfitnesspal.com/topics/show/855388-link-mfp-with-runkeeper-master-thread?hl=runkeeper

Personally, sync'ing is one reason why I've fully switched to Endomondo from Runkeeper (I used to always use both)..