I would like to give humble my opinion on something.
I think it would be good to have the wallet by its single denomination of SIA rather than KS. Or both options would be fine too.
It just would feel more marketable to offer a GB of storage for 13 Sia rather than 0.01317 KS. I am sure that development has more important things to do right now but these details can matter.
I see it this way too. Much more complicated to think in KS than simple in SIA. This way every new user would have to ask about KS to be sure.
This makes sense now. Siacoin' price now is about 20 satoshi/siacoin which will be going up with the growth of Sia platform. It means that the exchange between btc and sicoins will have no problem.