Do you mean with "the modification" above the maximum carrying capacity or the "double spending" thing you call very urgent later on? I fully understand and agree that the latter is important - it is actually my next todo. If you want to help, please take a look at
https://github.com/chronokings/huntercoin/issues/72 and give some feedback to the proposals. Also, if you have a stuck wallet for me to look at, it would help me, too. (I can reproduce a stuck issue, but it seems that it is not precisely what others are seeing - in my case, manually deleting all pending transactions from a wallet makes it "good" again. MithrilMan wrote that this is not the case for this issue.)
Regarding the carrying capacity: Sounds like an interesting idea for me and I could easily implement it - but I think we should discuss it more thoroughly before changing the game mechanics. Also, I usually like to give snailbrain the "lead" in game mechanics.

Thanks for domob's great work, sorry for my misunderstanding and improper words. The carrying capacity need to be discussed thoroughly, it is not urgent. Another method to solve carrying capacity is that: when the character carry more coins, it's moving speed will become slower,which is similar to real world, you will walk slower when you carry more things. All modifications of game mechanics have only one aim:balance.
The problem of double spending is very urgent. As I know, many old players can not stand up for the wallet rescan when there is double spending in wallet again and again, then they have to leave. if the problem of double spending is solved, BGB will come back, many old players will come back, that will be alive again.