Do you talk about dualOS image? On my VIM this jumper does not work, I still have to hold F button or reboot from Android to launch Ubuntu. So I don't get - you will will add this feature to next built or it is already "can be achieved with..."
I found no info about GPIOH_5 on the scheme. What is it responsible for?
In my case I would preffer to have LibreELEC (on eMMC) as a primary system for all the family to watch movies and Ubuntu as secondary for my Linux study. Or maybe to boot into the last state by default with an option (5-10 sec) to choose while reboot. The idea is to elude button manipulations.