Ideally, yes, because I'm hoping that this will get used a lot, and will therefore become rapidly annoying for admins to be sorting it each time. An automated system would also be able to have an automatic sunset system, wiping old messages after a week so they don't clog it up.
But for now, if this is the system you want to use, it's surely better than nothing. Could I request the first one be a link to this topic? That will let everyone know that we're trialling the system, and how they can get their own messages posted.
I really think this'll have a positive impact - there are lots of threads where people ask for minor help, feedback, playtesting etc. which sink either without a ripple or with very little notice. A system like this will help avoid that by emphasizing those threads that are more important (the modding ones), even if they're in obscure forums. Hopefully, it'll also draw a bit more community involvement - AFAICT, many if not most or all forum members can post highlights, but the reality is that only a small fraction do. Hopefully people will realize that as a more... Low key, I guess - sort of a system, access here will be perceived as being more open.