Ah. A topic near and dear to my heart. Yes Boat Mode is coming, on another blog the CEO sent me an update just a few days ago and it's in Beta testing as we speak and if all goes as planned it should be out with the next software update anytime w/n the next two weeks. My understanding is that with this mod, you can launch from a moving/rocking boat, it's automatic/nothing special you have to change, so I'm assuming they made some changes in the pre-arm checks etc. I've managed to launch from my boat a few times but you only get solo to initialize if in perfectly flat/glassy water.
As to the original question starting this thread, yes you can launch and let the solo follow you on the boat with no problem then land elsewhere, I've found I can get a couple of miles out of it or so, it depends on how fast I'm going, how much wind the solo is fighting with, all relative to the battery life. What I do is I just make sure than when the battery gets down to about 30% I'm already in the process of landing it manually, which for me what I do is just grab the thing from underneath right behind the camera (the main body) then power it down. Tricky and a little dangerous, but that's what I do.