Option to set up time-based notification expiration on channels

On many gaming-community servers, I'm getting role-based notifications that are relevant for only a certain period of time (typically 5-15 minutes). It would be really nice to be able to set up auto-expire of these notifications to reduce notification clutter in the UI.

In optimal world, it would be configurable in channel-role pairs, but even a user-configurable per-server setting of "expire notifications based on this role at x minutes after notification" would be great.