@Siele, not really, 9bb 3bet size in position, 10bb out of position. I mostly use them regardless of the villain's opening size. The pot is there pre because table tamer needs it. 4bb or 5 bb might be good too to raise limpers. Uuuh now than I say that, I don't have any memory if that actually works like that
I do not give it much thought but I do make my bets based on what I want to do the next round. I will manipulate the pot with odd bet sizes and observant plyers may notice this but it is still up to them what to make of it and so far players do not seem to notice. I wouldn't worry about it too much unless you find you are losing a lot then maybe you need to adjust..
Oh bet slider is something you use in online poker. Here is a picture: http://www.32redpoker.com/blog/tag/bet-slider/ It gives you a one click shortcuts for bet sizing.