The Epson (and Canon etcetc) printer drivers ONLY know about their own papers so you will NEVER see any Hahn. or Canson or whatever paper as a choice in the Epson driver. The way the system works is that if you use a 3rd party paper, you download the appropriate color profile from the mfgr and associated w/ that profile is additional information about which Epson 'base media' to use (that *is* defined in the driver).
So, you'd find what the base media for Hahn Bright White is and when you choose that paper in the driver (assuming that it is available from Epson in roll format), you'll be able to select roll. If not, you won't. You can get around this by having a custom profile made from a different base media.
All that said, in looking at the profile for the PR Bright White, it's based on Epson Velvet Fine Art which is *NOT* available in rolls. That is why you can't select it. I've heard their Somerset Velvet is very similar so you could try selecting that.
I've had situations such as Hot Press Bright where if I truly select that, I can't print small 5x7's in my 3880 because HPB is defined only for the rear feed which has size limitations. I got around that by redoing the HPB profile based on UltraPrem. Pres. Matte which can go in either feed.
So there is nothing really wrong w/ PrintTao, it's just operating on the information that the driver is giving it. If you really want to use PRBrightWhite on rolls, you will need to try the Somerset as a base and/or get a custom profile done.