Mass Export Invoices

Hello!
I find this plugin to be very useful, thank you very much!
One thing I struggle with, every month I have to send my accountant all invoices in pdf format. Right now, I click on every single pdf for all my orders, save all files, and then merge them in another program. But this takes quite a lot of time if I have lots of orders.
Could you please consider adding a functionality, where I would select the period and the plugin would output the pdf files or output one pdf with multiple pages, containing the pdf invoices within that period?
Thank you so much!
Cezar