They just need a drum option for you. That's all, and several of the bigger companies will offer both disk and drum variants of at least a part of their product line.
If you were really anal about the drum issue, you could always head over to a junkyard and see if you can find and yank off the rear end parts of a Forester or Impreza model with disk rear brakes. I do personally tend to prefer disk brakes because they are more even in behavior. Drum isn't bad, but they do operate differently than the disks on the front.
A note on Pagid friction levels:
TECHNICAL ISSUES FOR PAGID RACE PADS
Each line is in 0.05 mu increments, 0.35 starting at the bottom of the graph going up to 0.60. I'm personally curious about the RS-15 pads. They'd be somewhat similar to my Carbotech AX6 pads that I use in grip levels but a little more cold bite.
Carbotech pads (not really listing over entire temp range but only "operating temp" range
Bobcat - Mu is around 0.45 - temp range of ambient up to about 900F.
Panther Plus/AX6 - Mu is around 0.50 - temp range is 150-1250F.
Panther XP8 - Mu is around 0.55 - temp range is 250-1350F.
Panther XP10 - Mu is around 0.60 - temp range is 250-1650F.
Panther XP12 - Mu is around 0.65 - temp range is 250-2000F
Panther XP16 - Mu is around 0.70 - temp range is 250-2000F
The XP8, XP10, XP12, and XP16 are considered race only pads, but cold Mu should remain decently significant. However, they will pretty much never be in their "operating temperature" during normal driving...ever. Even my AX6 pads require more than one hard stop to get a good amount of heat into them. One quick stop from highway speed isn't even enough. There is a matter of need in terms of friction levels. You also have to consider linearity of the friction level from cold to hot and how this affects driving. Then there's dusting and rotor/pad wear to consider too, not to mention noise.