Custom textures, minimal functions

Arkio's online documentation explains that importing textures is reserved for the near future.
Since my interior designer business needs to be able to use custom textures, in this post I outline what for me are the minimum and sufficient functions.
Contribution from other users of the Community is welcome.
Since the textures in architecture usually repeat a pattern (for example a tile, or a block of tiles) I expect the possibility of uploading a JPG image of the base element and being able to define its size and orientation, the texture will follow repeating it side by side on the two axes (for each mapped face).
Defining the size of the basic module by dragging, the contextual display of the two dimensions in a WYSIWYG fashion would be really appreciated.
It is not necessary to support the PNG format but, since transparency is very useful (as in the example of the books among the textures available!), assume that the absolute white (R=255, G=255, B=255) is transparent. White could be reproduced with a very light gray (R=254, G=254, B=254). I understand that JPG compression can damage absolute white and this could be a good reason to support PNG transparency.
I expect Arkio to display in full resolution, optimized by some cache that retains the base module, leaving the user the job of degrading the image resolution in case the overall experience should be compromised by a low frame rate.
Thanks for your attention.