I would not recomend the PT-015 for cold water gloves. The buttons on the back are a CF, even with no gloves on. I can't imaging putting 5mm of rubber on your hands and being able to negotiate them, much less the jog dial.
Check out the Ikelite housing for your needs.
Ikelite C-5050 Page
UWCP.com Ikelite C-5050z Page
The stay depressed controls are a cool feature, and the jog dial is MUCH easier to use. You can actually feel the physical clicks as you change settings. It also comes with a tray and handle, which is an essential accessory for the PT-015.
Light & Motion also does well with cold water divers, and uses a similar jog dial system. I haven't used it yet, so I can't comment on how the housing will come together, but it has some impressive features (ttl ROC).
Ryan
www.underwatercamerapros.com
rc@ryancanon.com