trust me, having the shifter between gears with the clutch pedal out is no problem....
ever idle with the clutch out? it's an identical situation. the clutch disk and flywheel will be at identical speeds, the input shaft of the transmission will be spinning, but pretty much nothing else will be. i can't speak of specifics with your exact transmission, i have no experience with it.
i'm used to a shifter with some noticable resistance(and prefer it that way), so having it jump into an unintended gear has never happened to me, though i've been in some cars where i can certainly see it being an issue, they felt like a gust of wind would make the shifter flip between gears.
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