SilkCoin under 2500 SAT you will not get, because is very popular coin and everybody discover it,now it s starting the second stage of POW, but don't forget the blocks are 2500 coins and the ASIC for Scrypt are now available and they rent also big Rigs for mining the coin and the difficulty will be 10 times bigger than the first stage of POW. The coin is reasing on MINTPAL top and this is another reason for it s growing and next Monday is possible to be on Mintpal. If Dev will introduce the 2FA in the wallet, the coin will blow off in a good way
2fa in wallet for security would largely be a promotional tactic
It would be more practical to have a pin# (like mycelium has) to add protection to the wallet(this adds central server dependability, but so does authy /2fa)
If not for promotional headways, i would focus dev on more important wallet additions.