multiple paypal accounts

Yes, you can use a different paypal account for each of the payment widget you create with the shortcode. Check the following documentation:
https://www.tipsandtricks-hq.com/wordpress-easy-paypal-payment-or-donation-accept-plugin-120#shortcode_with_custom_parameters

Hi again,

I was wondering if it was possible to dinamically set the paypal account (email parameter), for exaple taking it from a textbox somewhere on a page.

No, it can’t do that at the moment.