For me in the POS process 2 major fix to increase the viability of slim (as other POS coin) :
Performance: POS should not take any power from computer or a very low part.
Multiplicity: POS should not increase the number of transactions. After calculation of the interest, the base + interest should be in a new unique transaction and the old one to be deleted. I think if you address that part It could helps a lot for the precedent part.
If you manage to fix these two issues you will be really close to success (at least technically)
