Hi @glenalbrethsen!
Just to be clear, we won't have to go in and designate the beneficiary if it's steemworld, but if we want additional beneficiaries, we will need to add?
Exactly.
And the amount to go to the beneficiary—will it be fixed, or can it be altered?
The amount for @steemworld.org will always be 10% (may change in future, but I first need to find out how it will work out with this percentage). Of course, all other beneficiaries can freely be edited.