Sorry for the slow reply. I took some time to read up on the Palladium system to see how easy or hard it would be to implement.
It looks like Palladium is a somewhat more complicated system, so I fear we won't be able to add it in the short term (though its now been added to the queue of systems to add ^_^)
Right now, you can already make a campaign using the 'Custom Game System' option, which allows you to use what is essentially a regular wiki page as a character sheet (so you can put down what you want). Unfortunately, that doesn't integrate with the dice roller or allow explicit fields just yet.
I think more players would be interested in adding their own fields though, so I am going to look into that, though it may be a little while before it gets done.