I don't know about your 1st statement if PoW mining is possible or not,
I did just try setgenerate true 4 in the console and it did not work to generate a PoW block,
if there are more commands, please share.
Your line 2 is totally wrong, PoS & PoW difficulty are not shared among any coin, they can't be , there are two independent ways to generate coins.
Same issue with the block freezing happened with PHS a few weeks ago, no big deal , as more blocks are available for staking the network returns to normal speed.
I still think that blockchain accept PoW blocks, however i missed that GetLastBlockIndex in this coin account on whether block is PoS or PoW. My mistake.
I will delete my previous message because it's partially untrue.
Your totally wrong about things here
Here is comparison of CBlock::AcceptBlock between standart codebase abd yours.
https://www.diffchecker.com/mc8jqidu
Left is yours.
You deleted check for Last_Pow_Block there. Where did wallet restrict PoW blocks?
There is no restriction, but there is also no reward. For initial distribution some sort of block generation is neccesary. Thanks for thinking with us.