You're right, the imageviewer replacement is still a bit open. Currently I use quiver from diablo repos but it is far from perfect, and not only because of missing icons for some buttons.

I actually quite liked imageviewer but I had to remove it if I wanted to remove tracker. My ideal solution would be gpicview from Debian but my attempts to install it directly (read: out of Easy Debian) have thus far always resulted in a bricked device (through replacing libc6).