part of the problem is that I've only been using FpDebug since I learned that it supported DebugBreak() (which I only learned very recently.) Since without that feature I couldn't use it, I didn't read the FpDebug documentation, consequently my knowledge of FpDebug is rather deficient and I need to correct that.
The links you provided will most definitely be very helpful.
As far as the "Watch Properties" window, I tend to favor minimal designs. In this case that means no dividers, just whitespace. To my taste the dividers give a cluttered look. The whitespace is usually enough (IMO) to create a visual separation among options.
I've attached a partially edited "Watch Properties" window. I've left some of the dividers to show the contrast. Personally, I'd get rid of all the dividers with the exception of the one that separates the "Memory dump" from the other options above.
I'd probably keep the small "dash" on the left hand side.
$0.02