Limit ring game betting/posting questions!

[drewjax]

I have 2 questions about limit ring play that sort of baffled me today.
1. When a player bets out and is all-in, why cant you raise? this makes no sense ot me. I flopped top 2 pr., smooth called the flop, and then the orig. bettor went all-in for .45, and the only option was to fold or call!! Why cant I raise? They obviously have side pots, as there was one on this hand on the river. Is this standard online for all/most sites or is it only on a certain few? Very strange.
2. When you are first sitting into a game, and you want ot post in the cutoff, do most sites charge you 1&1/2 big blinds? I understand that most do, if you leave/sit out and then return, but this site basically charges you the extra half blind unless you post right away, or I think wait for big blind. I know that there was a thread recently about posting in the cutoff, and leaving UTG, and almost everyone says this is what they do. Do you run into these problems at most sites.

Thanks