Oh believe me, I did try that!

In fact, I tried for 3 hours all combinations of z-depth and depth settings and never got it working.
You can try it yourself. Load up the Quest Log example, switch to a perspective camera, rotate the panel a bit and...the scrolling area is all goofed up. I think that's why Aren says you can remedy this "somewhat"...
And again, the bigger problem (for me) is that once you rotate the panel a bit, and switch to a perspective camera, the scrolling text will scroll right out of it's window, like so:

oh, and to clarify, this mostly/only happens when you use the mouse wheel...