I searched and didn't find this exact feature request, so if it's already here please reply with a link so i could vote for it.
Some times (many times) i start recording MIDI, and during recording i decide to stop and start recording that part again,
In Cubase (Any version) i just hit record again. what that happens is that the cursor (Transport) jumps to where i started the Current recording, and the recorded midi is cleared. the recording then resumes from that spot so i can start playing again until i get it right.
For me this is very important, one click and i start recording again and again, when i'm done i just hit stop as you normally would.
In Studio One 3 i have to stop and delete the recorded part before recording again...
So to sum this up:
"Re-Recording during Recording should simply wipe the current recorded midi and start recording again from the original recording position automatically"
Please bring this functionality to Studio One 3