About the 15 min edit, I see that it works differently than I thought it did. I think that 15 min is the right time period. But I think it should work differently. Here is the way I think it should work, you type a new post, or a reply. When you submit your post, It does not yet go to the Group, it is in holding, no one else can read it yet. You see the post with the 15 min edit function. As long as you don't leave this page you can edit your post. If you click previous or the link for the group or any other link, you are done editing, no more time left. This way you get a edit time of from zero to 15 min.
Come see me at Systematic Investing group #board-966 lets talk formula plans.