(Mod Help) How do I make peds mount the same horse as me in Rampage Trainer?

[feeips 0]

 

Hello! I've been messing around with the spawner option in rampage trainer and I can't get the peds I spawn to mount the same horse as me, instead they look for any nearby horses to mount and then follow me. I do know there's an option to teleport them to my horse but I'd love to make it happen naturally. I assume this is a flag that has to be enabled (or disabled), I know this is possible only because on the mod "Mary Linton joins the gang" there's a toggle-like option to make her ride the same horse as you or not.

 

Any pointers as to how to do this would be highly appreciated, I've been looking everywhere for an answer and couldn't find it.