As the party is over, I have just sent the temporary open air micromapping to hibernation. I did this by prepending the prefix temporary_ to all keys of the temporary objects.
The last time I did this, it happened that a fix bot dropped by and removed the prefix I added with reason. After that, a mapper removed the temporary objects. Unfortunately, there is no easy way to undo a changeset easily. I still hope that the objects now stay untouched until next year :) .
Have you asked international or german openstreetmap mailing list about a possible tagging scheme which could prevent the objects from being accidentally removed? :-)
What I’ve learned concerning discussions on the mailing lists is “First do it, then discuss”. Otherwise it is likely you do not get done anything for half a year ;-) .
You could use the “watching” functionality of the XAPI so you would be immediately aware if any of your “temporary_” objects. I did this quite a few moons ago during the Cyprus edit war…
See http://wiki.openstreetmap.org/wiki/Xapi#RSS_Feed
The RSS API call currently does not deliver anything, but I guess it’s a temporary problem. Nice feature BTW, thanks for the hint. Otherwise I would have written a small script invoked by a cron job which regularly diffs the current data against a local copy… :)