The problem with having each person post half of a slate is that a slate has no fixed size. The +1/-1 power, on the other hand, looks like a balanced way to reduce the chances of a slate veto, and we all seem to agree that whatever benefit there may be to adding the veto power, we don't actually want to see a veto happen. I see it mainly as an efficient check on that one option there seems to be somewhere in every project that would just cause more problems than it's worth. Requiring reasoning sounds good just because I'm always for more transparency in CAP, and if mod approval doesn't slow the process, then we might as well include it. I'm not sure how much hijacking a TL could do with the +1/-1 power, but I suppose the strategic removal of a popular option could do some damage. One should never underestimate CAP's best and brightest anyway, right?