Hmm. Does sound like a lot of work to manually sum up suggestions every time to present them with more details in a message in game, as well as coding a feature to up/down-vote said suggestions from ingame.
Reading this I immediately thought of our existing mail system, which isn't used much, but informs you every time in lobby if you have new mails. We could use said mail system to (automatically) send ingame mails to active users to inform them about forum news, VIP events and suggestions.