Please find me a single online poker site where it doesn't work that way. It's easier to code it the way you want, by the way - all the other sites wrote code to make it work this way, same as we did.
The point of mucking is to, well, muck your hand. In a real poker room it's considered poor etiquette to ask to see someone's mucked cards, but you're allowed to. So online, you have to take extra steps to get the cards.
Pushed a fix for the all-in issue. Once it's on the server, you should be able to hit Raise and have it work no matter what.
The bet input box now works as well. So, when the slider doesn't quite get you there (i.e. you have that extra .25 in your stack), just type in a larger number than you actually have. The client will bet the maximum possible in that case.
This is the quick-fix - I have a better solution for the all-in issue but it needs more testing than this one, and it's kind of important to fix, so you get the monkeypatch first