Thanks for the votes!

I think the open mic chart interface (and future similar interfaces) would be able to allow voting on entries without needing the user to go to Steemit.com.

Currently though, to enable that I would need to establish whether enough people use (or would be happy to sign-up for) steemconnect.com or busy.org, and it's hard to gauge. Steemit's complicated enough for most people already without requiring another related account login.