I have a feature I'd like to see implemented in FASM, and don't want to leave it to chance as to whether the developer sees my suggestion or not. Obviously he may choose to not implement it, but if I leave it as a post here in the forum he may not even see the feature suggestion. Is there any way to contact the developer of FASM and suggest a feature to him? Or is there a specific part of the forum designated specifically for leaving feature suggestions, which the developer reads regularly?

You have already contacted "Tomasz Grysztar", aka the developer. In some of your threads there are replies to you.

Just post your suggestion here in the appropriate forum, or send a PM.