To be honest I don't know if that would make things better or worse. imo it's simpler to have clear forum structure without the need to add additional information to the posts. Not everyone would do it anyway. Currently we have a bit of an overlap in some sections that can be fixed by combining existing things like stated earlier by someone while adding a few new ones.

The active topics already contain mostly uninteresting things to me. I tend to just browse through some selected sections and leave the rest alone. So while the ability to select the things shown in the active topics would be a nice to have feature to have I don't see it as the most important thing in this thing.