Well, I'm not yet an expert on this as I just recently read about it at
http://www.coindesk.com/bitgo-safe-aims-secure-bitcoin-wallets-multi-signature-transactions/

How about using such a multi-signature method? That way, a "consortium" can decide on the funds and needs a n-out-of-m majority for signing the transaction.

Also: Look at how Freicoin is doing on their end, they have the same problem to solve with their key where the fees go to.
About concerns of the dev using the coins other than expected: Well, whatever is decided, he has the private key of the address where they go to NOW anyways... Whomever he hands the key to, he might have a copy. Which does not mean I mistrust him, just stating the fact.
Could be solved by releasing a new code which sends the fee to another address, moving funds to that new address, and have that new address generated by a to-be-nominated comittee. Not sure if a multi-signature key would require a new address anyway (assuming that globe supports this feature or can be made to support it, not sure of the requirements here).

Kind regards
Mike