I hope this can make it in to 0.46, as I think my slide making utility which needs this functionality could be quite useful, and it would help the re-stacking effect too.
How should patches be submitted now? Launchpad blueprints? It wasn't immediately obvious how to use them, so I made this bug instead:
https://bugs.launchpad.net/inkscape/+bug/174701
This is the patch to add the command line switch --query-all which dumps id,x,y,w,h for all objects with an Id.
I sent a version just to Bulia by mistake, meant to send it to the whole list, anyway the version on launchpad corrects the transposition of x,y with w,h in the version I sent Bulia :-}
Cheers -Terry
[Nicu - thanks for your pointers about the ill conceived post to the users list, points well taken.]