It's up to each coder how they wish to utilise the support thread for their modification here @ vBulletin.org (if they support the mod at all).
If you look at our profile, you will notice we have 100 releases (at the time of writing). It is entirely impossible for us to keep track of the few feature request posts in the midst of thousands of pages of support queries, at least without the use of 3rd party tools like Jira.
Since we already have 1st party bespoke tools available @ our site that will allow us to keep track of feature requests indefinitely, we choose to tell people that in order for their suggestion to get taken into consideration they need to re-post it on our site.
Would you not agree this is fair?
Fillip