Great Plugin. Could it do keywords too?

I have been using Easy WP Meta Descriptons and greatly appreciate that each page can have a different description. I wonder if a second text entry box could allow entry of different meta keywords in the same way or if maybe there is some technical reason why not. Whilst I am new to web design, I have developed software since 1969 and learnt many languages culminating in C++ on the Mac but wonder if PHP is too different. I certainly struggle with the non linear nature of execution of CSS, HTML and Javascript. I have maintained programs with a million lines of source code before I retired. How many lines is this plugin and can I try cloning it and make it do what I need even if its just for myself?