Additional payment options sure would be nice.
They could change revenue share for projects that accept other payment options. Industry standard is 30%. You can offer other payment options with that. Itch's share is 10% default and some people lower it further, yet scream loudly when something does not work properly, takes longer or features are missing that the big players like Steam have.
Unfortunately, there are not that many options for low cost payment options. Crypto is not low cost. International money orders are not low cost. And since Itch does not have a wallet system, those paysafecards are not an option. As far as I know you cannot refund transactions paid by paysafecards - not onto the paysafecard. But it would be possible to refund it onto a shop's wallet.
A Itch wallet would solve some problems, but Itch's account security is ... not optimal. It's a combination of site security and other things. But Itch accounts are faked and hacked right and left. If there were wallets on the accounts, that would make this problem even bigger, as the hackers could make money directly. If Itch manages to clean up this mess, a wallet would solve a lot of problems. For perspective, I have seen literally hundreds of hacked accounts that were used to spread malware.
An external wallet would do. Paypal is such a service. Now we only need alternatives that offer similar functions, but without the things people hate about paypal. And Itch supporting those alternatives.