You may want to include:
1. Whether you choose to initiate NOCs,
2. Whether you will force-post transactions where the account number is incorrect but the intended account can be determined from other information,
3. whether you prohibit the posting of ACH entries to any non-transaction accounts,
4. procedures to follow if a dishonored return is received,
5. procedures on stop pay orders for ACH entries, and
6. procedures for supplying addenda record information when requested.
Also, even though you are only an RDFI, do you originate ACH loan payments from your bank? If so, you might want to include some discussion of those.
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"The words you say never seem to live up to the ones inside your head." Chris Cornell (Soundgarden)