I believe you still can do that. It's not the clutch that controls. It's the gear -- if it's not in gear, you can open the trunk. I haven't tried "high speed opening" but I don't see why I need to.
So you can drive 80mph down the road and shift it to neutral and open the trunk. Wind will probably push the trunk down a little.
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2000 Sentra GXE
5spd, Convenience Package,Gas Cap Holder
So you can drive 80mph down the road and shift it to neutral and open the trunk. Wind will probably push the trunk down a little.

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2000 Sentra GXE
5spd, Convenience Package,Gas Cap Holder