No offense, but I think it's a stupid idea to give people merit just for a local board suggestion.
Yep, that would be stupid. That's why it should be a moderated thread and the "suggestion posts" should always come from the moderator.
The moderator of that thread would receive a lot of merit, no doubt. Which is why I personally would suggest to let a bot be the mod.
1) It makes it impossible for newbs to show their support for a specific local board.
That's part of the intention. Why would you want "newbies" to vote for a local board?
That only incentivizes the creation of twinks for voting.
Also, the requests of people who've been on bitcointalk for a while might be considered a little more important, don't you think?
2) It opens multiple possibilities of both vote & merit manipulation.
I see none. Care to elaborate?
Sure, "merit sources" could upvote certain boards, but I don't think that'd be too bad, considering who they are.
Why not make the sticky & add a poll instead, then just determine which local board would be in high demand based on the poll results?
No cost involved, people would ask for a lot of petty forums just out of a whim.
Also, twink accounts to upvote a certain forum might become an issue.