For Warframes and weapons you can only use three different mod and appearance configs. For some Warframes and weapons I would like to use more than just three configs.
For example: For Nova I use a speed Nova and slow Nova for her 4, a speed Nova for her 3 and a build for her 2. That's already 5 different mod configs. And I don't like switching up mods in configs.
For weapons I sometimes need more mod configs. For example my Knell: I use three different status/crit builds with different elementals and a Eidolon crit build.
And when it comes to appearance for weapons I often use green, red, blue, white, ... colors and I currently have to change colours very often.
There also is enough space for more configs. I am just hoping for a change.