You can do all this easily with www.autohotkey.com
You can have a hotkey to open the MultiPicker send it to monitor 2 and maximize it or set it to whatever size you like.
You could make a shortcut to start Biab, then open MultiPicker and send to monitor 2.
See also Biab Workspace Layouts
Or you can wait years for PG to do it.

[Linked Image from reatrak.com]