Oh yes, you are right "ad libs" (XD).
I also hate it when she goes "AhAh! WOOOW! YEEEEAAAAH! C'MON" in upbeat songs. I think that is very annoying.
(Example maybe
I also think it's annoying how she performed SHAKE IT at First Class Limited Live and Hot Stuff at the SS tour.
SHAKE IT (First Class Limited Live): She only sung like what? 20-30% of the song? The other 70-80% was just the CD playing with her voice.
Hot Stuff (SS tour): I hate the way she sings it. She sings it so, vulgar (I guess). And again she did the "WOOOW! Pachi your hands!" thing.
EDIT: "Pachi" is Japanese for "Clap". Though it sounds like more as "Push"