Is there workaround's for the 128gb IDE limitation?

Yes, it is in the most recent versions of Hijack.

There's of course the issue of actually having a bigger-than-128 drive to even test it with. And also you'd need the builder-image to support drives that big (dunno if it does yet or not). But yeah, when the new drives come out, we'll probably have support for them pretty quick, I wouldn't worry about it.