[gentoo-portage-dev] Undo feature in portage-ng ?

Hi
I was wandering whether the are plans to implement a kind of undo function in portage-ng or even portage.
It would be very nice to have an option in emerge wich makes portage to record all the changes that are done during an emerge, so you can later undo this changes.
Somthing like:
emerge kde-3.2 --record-changes-in /path/to/file
and when you want get back to the previour version/state of system:
emerge --undo-changes /path/to/file

I hope this is the right place to ask for such things. When it is not (please let me know), I appolozise.

Thanks

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