“Page List” Block

I am wondering if the ‘Page List’ block is modifiable such that it’s possible to include a limited numebr of ‘Parent’ pages and sub pages, rather than all pages published to a P2?

I find the block is useful in the sense that it stays updated as pages are published or re-ordered. But being able to present just one parent page with sub-pages within that block would allow me to use that block for different navigational aids.

Let me know if the question is not clear. Thanks!