The prohibitions in 1026.38(t) about including other information prohibits including extraneous information in the disclosure itself. It doesn't prohibit a cover letter to accompany the CloD. For example, you can exhort the borrower to carefully study the CloD and contact (Name/Contact info) with any concerns or questions. You can include details on the time and place of closing, along with a reminder to bring funds needed to close the deal and a reference to the disclosure on where to find that amount, along with the form the funds must be in (cashier's check, etc.)
As to your second question, it could depend on the language of your loan commitment letter.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8