problem: single line scrolling (shift+up|down) does not work. since http://bugs.gentoo.org/show_bug.cgi?id=141908 is still closed I do open a new bug.
Created attachment 152379 [details, diff] add single line scrolling support
Created attachment 152381 [details] ebuild with single line scrolling support
Created attachment 152383 [details, diff] trivial one line scrolling patch
The patch has been purposefully dropped, because of a conflict with an extension according to bug 141908, so I guess this is a WONTFIX. cc'ing current maintainer, in case he thinks otherwise.
the tabbed extension is written in perl. so its a "either perl or one line scrolling"-problem which is handled by the ebuild patch i submitted reopened
I'll reconsider this for the next upstream bump.