I have multiple Vocaloids, and I can tune lyrics pretty well! I am reeeeeeeally unskilled at most things, including composing original music, being able to make VSQs from scratch, and mixing/mastering (which kills all my covers).
As for editing, I'm currently working on adding pages for songs and producers that aren't yet on the wiki (mainly English producers). I do take requests, so if you have a producer you want on the wiki, I'll be happy to add them! :D