tweaking the plugin itself is not recommended cause at some point it can be updated and crash, and its also not completely legal but we can build a series of new scripts to trick the existing code into making recurrent payments... If you want a cheaper option we could use a recurring plugin with other merchant just for those types of sales... there are many ways around, I'm around if you wanna further discuss!
Now, what I copy-paste about me:
I've been in a web agency as web developer (both front and back end, although I prefer the second). Before that I was a programmer in a stock-market related company that selled databases here in Mexico.
I'm an engineer btw. I'm fluent in English, German and native in Spanish.
I would love to collaborate with you, let me know!
Alex