Epics/Features board to allow columns built on filters (as well as releases)

While Aha! is obviously very focused on development and release planning, I often find myself wanting to use the board to organise and plan around areas of functionality ('features' in the broader sense) or initiatives, client work, etc..

Till now I have tended to subvert releases to allow this, but I'd love to be able to just define a column on the board using filters (effectively a query); basing that on tags would be most flexible.

This would be super useful for sharing general development plans; to colleagues (in detail), and to management (as a summary, with drill-ins of course). But most of all it would be where I could get an overview of what our product can do (shipped stuff), and what it will be able to do in the future, and how all that is progressing.

I'm unaware of any tool that really provides such an overview of existing and coming functionality. And while tying stuff to timelines is of course very important, a non-timeline-based organisational function would be massively helpful for me, the Product team, the design and engineering teams, and the wider business (sales, support, management, funders, ...). I know people would get this the instant I showed them.