Thank you for your appreciation, I've just had a look at the numbering issue you mention but really can't seem to see the problem, the numbering in the files is in [y,x] format for each exported sub-map.
On my system (Win 10) even if I export ie. several hundred sub-maps they all appear in correct order in the directory (without any leading zero).
It would be easy enough to add (the next update will make use of an ini file for minor settings tweaks) but I'm just not seeing it.
Sorry for the confusion. I'll give you an example. Here is a listing of a few lines from my map list. Since the macOS Terminal only looks at the first number and doesn't treat numbers as values, 1 will always come before 2 (10 comes before 2).
Rooms - SubMap (8bpc, 10x8) [1,5].bin
Rooms - SubMap (8bpc, 10x8) [1,6].bin
Rooms - SubMap (8bpc, 10x8) [1,7].bin
Rooms - SubMap (8bpc, 10x8) [10,0].bin
Rooms - SubMap (8bpc, 10x8) [10,1].bin
Rooms - SubMap (8bpc, 10x8) [10,2].bin
Rooms - SubMap (8bpc, 10x8) [10,3].bin
