Essentially start with an off-the-shelf open source feature voting solution, host it somewhere, make it "multi-product" where each product correlates to an apt package, contribute the modifications upstream to the feature voting system as needed, and the debian connection makes it not just some random website but perhaps something that feels semi-official (?) because people voting on something will really only practically have any kind of sway with some kind of affiliation.
Additionally it allows people to "contribute" to open source with just a click of a mouse - that simple act will help motivate future development hopefully to more desirable workflows and interfaces.
It sits adjacent to issue tracking and bugs because user preferences are not software defects.
I am increasingly thinking this is a missing piece of how to orchestrate open source and might be part of why open source desktop apps have actually fared quite poorly in adoption curves when compared to say, python, postgres, or the linux kernel. kdenlive, libreoffice, krita - nowhere near the penetration numbers of say... wordpress. This might be a missing fundamental piece. Maybe...
~chris.