I think a Trello board for non-technical stakeholders to raise a load of stuff is probably a fine idea, and almost certainly better than hastily firing off emai

I think a Trello board for non-technical stakeholders to raise a load of stuff is probably a fine idea, and almost certainly better than hastily firing off emails that will disappear into a blackhole, as you mentioned earlier. As long as that board doesn't interfere with an actual development sprint board, I would be totally happy!