Currently if I have a few blocks selected, then I click (without CTRL) anywhere, the selection remains (or, if I clicked a selected block, only that block becomes unselected).
Not sure if there’s a standard for this, but this is different from most software I use. Usually clicking anywhere without holding CTRL unselects all (same as ESC does). Also the CTRL modifier is always needed to add/remove items from a selection.
I guess I could learn AT’s system, but I’d rather have it use the same standard as most software (unless there isn’t really one).