First of all, huge thanks for this wonderful software, I'm happy to see it's still being developed!
Now to the suggestion - the themes installed from ux0:/ (not sure about the ones installed from the website) stop working properly when I swap memory cards, because the theme is no longer in the folder. Yes, this can be fixed by installing the theme again on the new memory card, but I was thinking about a more universal solution - why not let us change where custom themes are loaded from? Say ur0:/customthemes instead of ux0. I don't know if they're going to work without the program on the new mc, but I'd rather move Custom Themes Manager to system memory with Application Storage Manager anyway, if it had that feature.