The workaround is now in SVN, but I still need clarification if it's a MAME bug or not (I'm convinced it is because coleco is the only system - see below - where this is different). Also, other front-ends may suffer from this as well.

Code:
rene@marvin:~/src/mame-git> sqlite3 ~/.qmc2/mame-xml-cache.db "select xml from mame_xml_cache" | grep -Po "interface=\"\:.*\""
interface=":coleco_cart"
interface=":coleco_cart"
interface=":coleco_cart"
interface=":coleco_cart"
interface=":coleco_cart"
interface=":coleco_cart"
interface=":coleco_cart"

EDIT: I filed an MT bug.


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