As escrow for Waves for encryptotel I think that the right solution would be to set a buy wall with a part of extra funds invested after the ICO cut-off time. I can see that the most investors understand that the extra funds will be used to develop the project, and will make it better. So it's a win win situation for everybody. Some people try to create drama where there's not any. If you're unsatisfied with this ICO you'll have an opportunity to sell into the buy wall. Yesterday a voting was suggested, but I don't see why it should be better than the buy wall solution.
I agree with your solution, the buy wall.
This will let a way out for the ones that are unsatisfied with the way the ICO ended!
More funds is much better for development.