FF6LE Requests & Suggestions

This thread is for the developers of FF6LE, or the Rogue edition to read. It's also for us whom use it who want to request a new feature, or a fix.
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I've used FF6LE extensively for a few years now and my only suggestion as of right now is the ability to alter a tiles 'subtile' and have it save. If this were possible, I could essentially add a shit ton of new tiles to a tileset, and utilize them through subtile manipulation.
Look at the above screenshot as an example, those blank squares with square dots inside them are unused and quite possibly usable. If the subtile feature were to save and not revert back to it's default position, all this would be possible.
So, this is my suggestion, do any of you have suggestions that Lord J or some other developer of the program may or may not be aware of?