IMHO a forum is not optimal to handle a large number of suggestions. Software like uservoice is much better, as it asks members to review suggestions and to vote the most wanted suggestions up.
If you do proceed with using the forum for suggestions, then I'd like to suggest the following to get a bit more order and overview in this forum:
- merge all threads that discuss the exact same suggestion.
- either add more sub-forums or add prefixes to designate what part of the software the suggestion refers to.