Thanks for that d/u
After more playing I've found that ONLY on an x40 if you DO select car/taxi/other/van you lose the option to change vehicle profile again unless you remove SD card/reboot/re-insert etc or do a factory reset THEN you have the option back.
However, on One XL or x50 device the option still remains in preferences page 1 and for the x20/x30 it's still on page 7 so it does seem that this glitch/pain only applies to x40 devices (not had a chance to test an x10 but I reckon that will be similar to the One XL/x50)
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