Third person for all characters is currently fourth on the voting list for development, hopefully it won't be too long if the votes don't swing too far between now and then.
You can actually have third person for all characters already, you just need to change a few lines in their FPE, you just can't use any weapon other than the staff, although there is also a way to use other weapons, but that involves editing the staff to have a different model and remodelling the projectile it uses etc, a lot of fiddly work.
As to making a side scrolling game, it's already possible to a certain extent, you can already fix the camera into a side scrolling position, the only issue is you can't fix the axis of movement on the character, meaning you will still be able to move in all directions instead of just left right up and down. Also, AI doesn't work on multiple levels so any side scroller you would do would have to be on ground level at the moment.
The below video as made by Sincromesh
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