how is the play to be called decided? i'm using Short pass and 2RB/1TE/2WR as an example

is it Short Pass, 2RB/1TE/2WR, then play or
2RB/1TE/2WR, then Short Pass, then play

this is pretty important since if it's the second it would mean there would be situations where you couldn't call Short Pass when you should if it selected a Personell Set that didn't have any Short Passes selected. and if it's the first i hope it would automatically filter out the Personell sets that don't have a Short Pass in them instead of selecting just a random play

Play type is selected first, then a play is selected from that play type (if available in your game plan). If the play type is selected and there are no plays of that type in your active plays, then the play type is ignored and all remaining weights are used.