Replacing ptrace() - Creating new syscalls, what about the BSDs?

One of the things that puzzles me a lot in the creation of new Linux system calls is the null synchronization or even simple involvement with any of the other free Unix alternatives, at least the most common one: FreeBSD.

Has anyone tried approaching the other sides? Yes, the BSDs can create compatible system calls anytime they wish, but is there not any value in involving them in those activities, which basically extends the classical Unix and POSIX interfaces?

With the fear of sounding a bit trollish, people used to attack Microsoft cause they forced their own way of doing things to the rest of the PC industry when they were in their most powerful position. Is Linux heading to a similar state of "implement it my way or the highway"?