I've created a tool which could dramatically decrease the time it takes for you to make all your Paypal-payments if you can't use their mass-payment feature This isn't actually a CAC-mod but I think it could be helpful for most CAC-webmasters so I posted it anyway.

Here's how it works. You create an Excel-sheet with two columns, the first column contains the e-mail address and the second the amount for the payment, I usually copy and paste this info from my payments-table in my database to do this.

Then, when you start the tool it will first ask you for the location of the Excel-sheet.
After that the program will navigate to paypal.com so that you can log into your account.
After logging in you go to the send-payment page.
Here's where the fun begins :-). The program has a button called "Prefill the form" when you press this button the fields on the send-payment form will be filled in automatically for you based on the information from the Excel sheet and then the form will be submitted. When the next page has finished loading you press another button called "Save payment" which will submit the payment and write "paid" to a third column in the Excel sheet to show that the user has been paid.
The next time you press the prefill-button the program will look into the next row on the sheet to pay the next user and so on...

Here are some other features that I've also implemented into it:

*You can write the subject and the message in text fields on the program. This makes it a lot easier than re-writing it each time on the send-payment page for payment you make.

*If you restart the program between two payments it will look for the "paid" field in the sheet and detect which user that should be paid next, so you don't have to worry about keeping track of which payments have been made yourself.

*The "Save Payment" function also can send the email-address to a script on your own server to update the database on your server. I'm using this myself to update my payments-table on my server.

*The payment type is automatically selected as "Service" on the send-payment page and the shipping address is automatically deselected on the confirm-page.

*It has some basic error-catching mechanism so that it won't try to fill in any form unless it's the correct page and it has completely loaded.

I'm selling this tool for $60, I can customize for you a bit if you have any specific needs.
Let me know if you have any questions!