My quick review:
Took the Revo out a few weeks ago, with Sail.
As is, a Revo with no outriggers is a bit tippy if you get any serious wind. Sure, it was fun in the harbor with no gear, and that is probably how I will be using the sail.
As far as trying to fish while under sail, (IMO) I don't see it happening. Just too much to have to pay attention to. Add the weight of the sail/sidekick, gear, etc ... and your pushing the limit of the Revo. Not to mention if you hookup and the hassle of having to navigate your line around the mast and line.
If your going to use it to get out/back in from your fishing grounds, sure it will work, and you can wrap up the mast while fishing, but it is still there and too tall to stow. Besides, I would not go outside of my normal range on the Revo, under sail, and have to rely on the wind to bring me back anyway.