To clarify my needs a bit more:

I want the Categories from Listbox/Pulldownbox (selform) sorted:

cat_depth, alphabetic followed by cat_title also alphabetic

Would look like:

- MainCat A
-- SubCat A1
-- SubCat A2
- MainCat B
-- SubCat B1
-- SubCat B2
- MainCat C

etc. etc.

Already tried to touch the categories query directly in file "read_configs.php" (around line 77) by trying various ORDER parameters but that doesnt considers the "cat_depth". Which means that the corresponding array (piCal.php - "function get_categories_selform") needs to be sorted, unfortunally my php skills concerning multidimensional arrays are limited to get it done by myself.

Any help is appreciated.