Hello,
This link is the latest custom kernel that feederchain compiled:
https://www.dropbox.com/s/l96mgbsc2r8b7wf/custom_kernel_1.20150619-1.tar.gz?dl=0
I’ve just checked and the link is not dead.
This kernel works perfectly using the latest v3 beta 4.
Here’s the related topic: http://blog.petrockblock.com/forums/topic/autofire-on-the-axis/page/3/
This topic was about auto-fire issue (which has been fixed in latest official kernel) but also covers the 2 players issue.
Hope it helps.