Thanks!
It'd require a decent amount of changes for Vessel to work like Streemian or SteemAuto, but not impossible.
Right now Vessel is designed to just poll your account itself and a few other various things depending on which screen you're looking at. In order to make it do vote-following and reactive behavior, we'd now have to stream every operation in every block to analyze their content, to decide whether or not to perform an action.
That's a lot more data to process than Vessel currently handles. You'd also have to leave your computer unlocked, wallet unlocked (key unencrypted in memory), and be connected 24/7 in order for it to work.
With that being said - it's definitely possible. If it were added to Vessel, I'd like to see it as a plugin of sorts that users would have to enable and understand the impact of it. Maybe it'd fit nicely in the new "Advanced" section as something you could turn on and off.
@jesta that is the thing really as you said" I'd like to see it as a plugin of sorts that users would have to enable and understand the impact of it."