I just installed that mod to check it out. It looks like it will need a little modification to be able to change the value from a pulldown with currency values to a text field that will accept %, like in the regular coupon admin. This will also need some of the code from the coupon_admin file.
For your case, an easy fix once you have all 1100 coupon codes in the database, you can use a statement in tools> install SQL patches to bulk change the coupon type from F to P (amount off to percentage).
Code:
UPDATE coupons SET coupon_type = 'P';
This is assuming the amount is already set to 25.
This will change all coupons to percent off, so if you have other coupons that are free shipping or amount off they will be changed, too, and would need to be manually changed back.
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