There's no specific marking that says you have to switch hands, so don't switch hands if you don't want to.Anyways, Scriabin was crazy, so you'll run into all sorts of weird stuff in his music. Although the thing you showed us isn't that weird.But that's early Scriabin, so his writing is pretty normal for his time. But wait until you get into his opus 60's and 70's! Now that's when you'll see some pretty weird stuff.The reason why the some of the bass clef notes are higher on the keyboard than some of the the treble clef notes is probably because composition reasons. Nothing to do with the actual technique.
I agree and disagree there, sometimes composers write in such a way that makes the melody come out easier with crossings
You mean the last thing I said?Well DUH!!! It just depends on the piece. I guess I just said it wrong.