Is there any way for me to disable the built-in (default) selection deprioritisation, with a UI mod?
By 'selection deprioritisation', I mean the way that, after I drag select a bunch of units, depending on what categories of units are included in that selection, certain categories will be automatically removed from the selection.
So, e.g., I can drag select a bunch of factories, if there is nothing else inside the selection box, but if I drag select over a region with both factories and mobile units the factories will be removed from the final selection.
(Like in the 'Selection Deprioritizer' UI mod, but this happens to some extent by default, also.)
The reason I want to do this is that I want to set up my own, generalised, filter down mechanism, based on hotkeys, where I can drag select and then filter down to whatever category I want, myself, using hotkeys..
You may want to look at this mod:
Which does exactly as you want with regard to using a button to filter down. I still need to work on the readme, I'll do that later today.
About your first question - I'm not sure if it is possible but I'll look into it later today .