First, I wanted to thank all of the Effective Altruism Global organizers and participants. I found it to be very valuable and overall well put together. There was obviously a ton of work put into it, most by conference organizers who I don't believe will get that much credit for it, and I very much commend their work.
That said, there's always a lot of room for new ideas, and I find I often get a bunch of ideas at and after these conferences. Because of the EAGx events, ideas described now may be able to be put into action somewhat soon and experimented with.
As may be expected, I recommend that people make all of their ideas be independent comments, then upvote the ideas that they think would be the most useful.
I think there's a risk that explicit computations might lead both your audience and yourself to overestimate your own confidence.
Moreover, doing them in a way that's well-calibrated to potential sources of risk and error is a skill, and I wouldn't want to suggest to people giving presentations either that they should make something well out of their field of expertise an important part of their talk, or that they shouldn't give a talk if they're unable to accurately compute EVs for the things they suggest.