Comment 1 for bug 555449

Followup: I've been doing some research, and it looks like the functionality probably disappeared when the GSoC node work for last year was merged into mainline here:
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/8976#src/node-context.cpp
Specifically highlighted is the file where I believe to be the culprit was removed. Perhaps the developer should be contacted.
(Specifically, I'm looking at lines 588-593 in node-context.cpp, which is where I'm thinking the key is captured; I'd use that as the starting point in sorting the rest of this out...)