I am using a 2012 CTSV OS, so if there is another vehicle that I could segment swap from to make this possible I am all ears.

Without having a BCM in my swap to change the shift pattern types, is there a way to change the shift scheduling when the selector is in "D5"? I see options for shift scheduling an "D2" and "D1", but no other detents. I would like to have my vehicle either hold the gear currently in when shifted into "D5", or have it safely shift down to 1st and hold it.

My trans selector has the following detents: P, R, N, D6, D5, D5, INVALID.

Thank you.