Program disclosures are obvious requirements, take time to compose, & are a constant source of technical violations, but MoMan raises a more serious issue about payment schedules. Depending on how you index and price your products, you may fall into the special rules for transaction disclosures. Interpretation or calculation errors involving the payments schedules for transaction disclosures can be reimbursable and can do serious harm to your compliance exam rating. These rules are discussed in the OSC to Section 226.17(c)(1), #8 - 10. Study them and search for BOL discussions using terms like "discount", "premium", and "par", combined with "ARM". "Fully indexed rate" is another good search term.
The worst reimbursement case I've seen in 39 years experience with Reg. Z was caused by a simple calculation error for discount ARMs.
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...gone fishing.