Unless there's something weirder than usual going on in EFI, rEFIt appears to achieve this by turning off the cursor as one of its early initialisation steps; so it should be sufficient for GRUB to do the same.
I have a preliminary patch for this now which I'm testing. I'm afraid I got caught up in some build problems so it isn't quite going to make Alpha 2, but it should be no problem to land it just afterwards.
Unless there's something weirder than usual going on in EFI, rEFIt appears to achieve this by turning off the cursor as one of its early initialisation steps; so it should be sufficient for GRUB to do the same.
I have a preliminary patch for this now which I'm testing. I'm afraid I got caught up in some build problems so it isn't quite going to make Alpha 2, but it should be no problem to land it just afterwards.