Now I get it, you want something like xCustomListView.
Honestly, I have never considered it a good thing to leave the freedom to insert a custom Layout, this exposes you to errors, problems and often the resulting layout is unpleasant to see.
I preferred to create a List that, regardless of the developer's skills, was functional and pleasant. In fact, in the background there is a fading color effect and many other small graphic and animation details that make it always and in any case elegant.
This could not be guaranteed if you allowed to customize the layouts
In any case I will see if it will be possible to implement it in one of the next updates. The class has a particular structure to allow animations and graphic effects, so it could be complicated to add your request. For this reason I do not guarantee that it can be done.