I've uploaded all the changes I made to the proxypool and Web interface for PLX to github. I'll try to polish the instructions or write a guide tomorrow, but if you've already setup a node then you shouldn't have a hard time implementing the changes. If somethings missing let me know and I'll fix it tomorrow.
For payouts you need to add columns in the database, I added the commands to the howto. Apart from that the changes should be fairly easy to incorporate.
github.com/svk31