I'd do Task #2, too, but for the fact that I use Opera which isn't supported by StumbleUpon 

There now is operastumbler which I am happily using. Version 1.1 is quite advanced already and I use it frequently. You have to provide your ID, screenname, and password though. I didn't have a problem with that, you can inspect the code where the credentials are used.

I am really happy about operastumbler. Now opera only needs to stop raising itself and thus stealing focus and it will be teh bestestest browwwser out there.