Well, downgrading to the previous version of network-manager is certainly a good option - especially since it works.
I am unsure if the Mint developers are worried about Debian Squeeze/Stable since the true LMDE is tracking Testing. Keeping LMDE tracking Stable is a personal choice, but not certain if Mint will support that method in the long run (with the MInt repository).
Submitting to the Debian bug-tracking might be an option, but I am not positive how they are dealing with derivatives such as LMDE right now - especially when LMDE is focused on Testing instead of Stable.
Since Debian Stable/Squeeze is only going to get security updates, there really will not be that many updates to worry about. If you see where network-manager is requesting to update, just set it to pin the version you want or ignore that one update. You will figure out the best update method for your needs whether it is MintUpdate with all 5 levels, Synaptic, or via the command line.
Just for the record, when I update Debian Stable, I use:
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aptitude update
aptitude safe-upgrade