I'd say that:
1. it's good that you've shown the user the developer thread. Nice of you
2. you shouldn't expect user read all / any threads before suggesting. It's up to him to do or not to do that. Especially if there's no forum rule about it. That's why the number 1 is even nicer of you.
3. if somebody wants to share this opinion or its part with the developer personally, just go and quote it in that topic. (Nice mk3)
"Consideration for the developer's opinions" will take everyone to know dev's opinion to be able to consider it, and there's no rule for it again AFAIN... as tastes are different you can't force players to consider anyone's opinion. It could be ignorant from them to not to, but I don't think you can blame anyone for it. In the end, it's developer's call to decide what to do with the game. User's roles are ability to suggest and probably sometimes even be heard / considered sometimes.
I hope I didn't sound aggressive or anything, I just hope that people will be given the right of the voice even if someone thinks that they say it "wrong way / place / time / manner". And you as the representative of the law in here won't be abusive with your power to shut the voice. I really hope you have the set of criteria to determine if you have the right to apply administrative force or not.
Besides it, I hope your work will improve the forum experience and I'm not going to mess with you, in opposite, I would like to help you with it.