Neil,
I can do an 8" minimum print as well. The only other got'ya for borderless is that it expands the print for overlaps by a percentage. Thus meaning on a series of say 6x 4x6's 'expanded' to fit borderless, every print will be just so slightly off. This makes printing exact sets useless.
What I have done (before I read this review) was make a template slightly bigger, dealing with borders and just fit them inside the limitations with minimal waste. If you'd like to bring this up to Ron, please do. I don't have a direct e-mail for him.