Eh, sure. I guess this is a relic I do from when plugin options were sent via XML attribute names, which spec said all lowercase. It hasn't been enforced and the XML parser isn't used, but no where have we decided to move to camal case, so I kept doing lowercase.

XML died in popcorn.js 0.2...

Example, zindex is not zIndex. I suspect any plugin's with options I have introduced are likely all lowecase.