Will the coin retain its name and ticker? I reckon this might be confusing for a little while after the transition.
Max stake 30 days
that means if I have mature coins (over year old) and launch wallet only now, I can't receiwe staked rewards?
If you haven't been staking the coin regularly for over a year, then a max coin weight restriction shouldn't matter much to you since it's very likely that you wouldn't be staking in the future either anyway.