And it's my bet that your forms vendor can't produce anything warranting their inclusion of that option. I agree that UTMA statutes don't permit a minor's direct access to the funds in the account. This situation is ripe for a standoff with the vendor. You should demand documentation of its position.
In the meantime, you'll have to ensure that your new accounts staff don't allow that box to be checked, and that they have a script to explain that the option is not available.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8