Arson has a bug that means you can't choose an iso image from the program (the dialog doesn't show up. This has been fixed by the following patch: http://sourceforge.net/tracker/download.php?group_id=37704&atid=420756&file_id=34459&aid=632449 I have added the following section to arson-0.9.7.ebuild: src_unpack() { unpack ${A} cd ${S} patch -p0 <${FILESDIR}/arson-write-img-fix.diff } It works perfectly, so it is time for an arson-0.9.7-r1.ebuild :)
Okay, it's in the CVS. Thanks for the report.