I would assume that the suggestions relayed by users of the SOFU sites to The Company which are ultimately implemented are considered, at least by Jeff, Joel, et al as good additions to the sites in general. I wonder if it would be appropriate that these interested users be rewarded for this behavior.
I offer for discussion the implementation of a meta-specific badge for a user who proposes a feature which is ultimately implemented. With a certain lack of creativity, I propose the name 'Business Analyst.' A nuance could be that you need to receive n 'status-completed' tags before earning the badge.
In the spirit of the Japanese adage 花より団子 ('hana yori dango' or 'f**k the flowers, give me dumplings'), instead of a badge, a rep bonus could be awarded per 'status-completed'-tagged post.