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Boot priority would sort out any confusion between partitions (which of course would need different names...). Yeah, it's easy to swap boot partitions, or select a different partition from the early startup menu, but that's all extra steps, and it sounded like he wanted it automated. ROM switch and everything else takes care of itself. It's how I set up my dual boot 3.1/3.9 system - if the mouse button is held down, it switches to 3.9, then the ROM version is checked on the 3.9 reboot so that the 3.9 partition is automatically selected if the 3.9 ROM is loaded, otherwise it boots straight into 3.1. It all comes down to where you want to put the complexity: Either in the ROM switching process, in the boot process or in the installation of other software process (since non-standard startup-sequences require special attention when installing anything that needs startup-sequence activation).
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