Myschel, I read thru your trez's procedures and didn't think it was overkill (in concept, but to write all that down in such step by step detail is VERY thorough). I wrote a 20 approx page manual before I left office as Treasurer, so obviously I value standard operating procedures in this area.
We adhere to several important financial controls. This area--maybe above all others in the PTO-- require absolute clarity, openess, and faithfulness in duty.
To summarize our PTO's overall basic procedures: EVERY financial transaction (check, deposit, withdrawl for cash boxes, or miscellaneous charge from Scrip, for example) is substantiated by a color-coded paper form. The information for each type of form varies, but essentially includes a reason for the transaction, date, names, PTO account(s) affected, amount, and TWO authorizations. Additional substantiating info (ex: receipt for reimbursement request, deposit slip from bank for deposits) is stapled with the form which then serves as a tickler for the treasurer to update the computer accounting system. Finally, every form is filed for future reference. Last year, we processed 75-100 each reimbursement requests, deposits, and about 50 check requests.
After 4 years as a PTO treasurer, I wouldn't trade detailed controls for an easy job. In my opinion, if you have one treasurer who wants strict financial controls, make her head treasurer and let the other be her assistant. "Overkill" procedures only "bog down" one person. If she's ok with the load, take advantage of her fastidiousness. Your $ will be safer.