I am not aware of any other restrictions.
Offering a five-year balloon under the temporary balloon QM rules is a great option for all consumer credit transactions secured by a dwelling after the January effective date. The HOEPA balloon restrictions (seven years) expire at that time.
The loan must have a term of 61 months or longer under Section 1026.43(c)(2) (the general ability to repay rules. Under section 1026.43(e)(6) (the temporary balloon payment QM) the term must be five years (60 months) or longer.