Well, I don't know how often anonymous giving would be needed. If it is something that a lot of people want then I can do it.
In the meantime, if you want to anonymously give acorns to someone, send the acorns to me and then reply to the tree mail that got created by the system, and let me know who you want them sent to, and I will pass it along. You can also include an optional message that you would want me to copy/paste to the user.