There are a couple of solutions to this. As annoying as it is, this seems to be a Webkit problem , or Webkit intregration issue rather than Orion issue to some extent. Yes, Orion can fix this with ease, but I understand they might not want to.
I will suggest a couple of software : Mac Mouse Fix 2, Mos.
I personally use Mac Mouse Fix 2, it is flawless.
I hope this helps.