Default [Q] Some easy way to share a folder and/or SD card to more than one users?

Again, title says it all.
I searched and seems there are no "user-friendly" solutions to do this on any device.
Is it possible to make an APP or something that does that?
Else is a major waste.
I wonder why Google didn't think of a (user) "shared" folder concept when they added multi-user support. It's not like it would be a novelty.
NLS
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Devices: (many in the past, still in possesion the following) HTC Touch Pro 6.5.3 NRG, HTC HD2 (RULEZ) 6.5.3 Artemis, Samsung Galaxy Note (magic).

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Also: THIS guy is unbelievable! (in a bad way)