Problem with applying theme after enabling On-Screen keyboard

I cannot apply another theme than the default samsung theme after enabling On-Screen keyboard. I want the look and feel of the new Nexus that is why i enabled the on-screen keys and use third party launcher to theme and use stock lollipop icons.

I want to use the "Material Design" Theme but another problem would be the keyboard being themed. I only want the stock apps being themed by it. I hope someone interested with theming would be able to help me. Thank you in advance.

Enabling multi-user functionality?

So just got my hands on one of these. One thing I noticed/realized that would be a big deal for my intended usage is being able to enable multi-user functionality so each person that uses it can log in to their own profile.

So far on researching I have seen very little discussion on this matter. At best I see no option in the stock rom and no mentions in third party roms. If this is indeed available in third party roms I would not be averse to giving them a shot. I have also seen build.prop edits to enable that and they seem to be the same edit across devices so I'm assuming it is a standard android thing. I haven't had a chance yet to root my Player but is there a chance adding these build.prop options could also work on the stock rom?

Thoughts? Btw, I have already updated to Marshmallow however I did find a post around here that seems to indicate it is still relatively easy to root so once I get time today I am going to go down that route regardless.