What about those bonus points - Am I still better of connecting up to 3 Rigs per username or can I also connect like 20 rigs with the same username for more bonus points ?
To my understanding you can connect as many rigs as you like with one username/passkey. I have at times four clients running and no issues.
With the way the CureCoin and the pools are setup I think one username is anyway the way to go.
Just make sure to not have a simple type in the passkey, copy&paste is your friend.
Using the same passkey in 20rigs also make the required qualification very fast ;-) 10WU on 20 rigs should not take long.