One of the top voted must have features.SaX3 for openSUSE, a new version of SaX for xorg.conf settings generation.
Despite all the efforts that have gone into making xorg.conf obsolete people have found that a once powerful tool is sorely missed in the latest openSUSE as "good enough autodetection" isn't good enough for a lot of end users. BTW, "for openSUSE" isn't necessarily true. SaX3 is aimed to make it easy for other distros to adopt (ala no ycp).
One feature that is also a little bit important is to make it distribution independent to make it easy for other distributions to use it, improve it and contribute back, so we will make a world better place for all of us