Have ou guys tried any of these? Can tell us which one allows more than 1 tab and how many you are used to get?
I must start by saying that I haven't tried to make bets in 2 or more tabs or windows because I would rather increase my bet amount than doing something like that.
If I was to bet 100 satoshis in 2 tabs, I would make 200 satoshi bets directly in the single tab.
You may try primedice if you only want to place dice as they are dedicated to dice only and must have the best system in place for people with slightly different demands and playing styles.
A curious question, how do you make bets in different tabs when you are betting because you need to click the bet button and you normally should be able to click in a single tab at one time. Are you using some script or auto-bets?