@bb - I've tried this, this doesn't appear to work. It looks like the Gtk2 pinentry doesn't grab focus when doing authentication, either. Interestingly enough, it also doesn't show in the taskbar.

I think the point of my request was originally missed. I will take a screen
capture of the pinentry workflow during authentication and signing tasks -
in my opinion, they should be the same. However, during signing, the window
gets display focus (Windows switches it to the active window), whereas
during authentication it does not (and has to be alt-tabbed/switched to for
pin entry).