Regarding the toning of the characters: That's exactly what I am trying to do. I want to add a color-field that you can use to set the characters skin-tone by setting it to a specific color. If I get this to work properly, it could get extended to eye-color and clothes as well.
I already have transparent backgrounds on my list, shouldn't be too much of a problem. I'm sure v1.2 is going to bring a lot of neat features.
Thanks for your feedback!