Tab and Enter support on login dialog

[shenjoku]

I've noticed that in the Velocity engine you can tab between the username and password fields but you cannot hit enter to login. You have to manually click the button using the mouse. Inversely, in R^3 you cannot tab between the username and password fields but you can hit enter to login.

Would it be possible to add both tabbing and enter-to-login support for both engines? It's a little frustrating to deal with, especially since I use standalone so I have to login every time I want to play. It would be a lot nicer to be able to use keyboard only so you can just type in username, tab, type in password, hit enter and bam, done. No need to switch back and forth between mouse and keyboard.