You can add feature requests as news tickets to http://open.silverstripe.com. Sign on on that site and click the new ticket tab. When creating the ticket make sure you assign it to the modules forum component.
When you make a feature request it is good to be as descriptive as possible and to outline the user case for it.
Pagination inside a Board?
Sorry what are you referring to? Forum Topics and Forum Threads are both paginated.
Set "hot topic"
What would a hot topic do? Eg display in a list somewhere? We have sticky threads which stay at the top of the Forum Topics list but what would a hot topic do?
You can get the link to the correct forum and post by clicking the little arrow on the title of the users post. This will show you the direct link to that post. How would trackbacks display?