SystemTap questions: user/kernel communication & pass compiilation options to module build

[Dave Nomura]

I have a few general questions about SystemTap

1. is there any SystemTap mechanism that would allow a user program 
(invoked by the -c SystemTap option) to communicate with the generated 
SystemTap kernel module?  I am trying to port a kernel module to use 
SystemTap and it creates a  character device that the user program can 
use to communicate to the kernel module via ioctls.

2.  is there any way to pass options to the compilation of the SystemTap 
generated module code?  I was thinking that this would allow me to pass 
a library of kernel driver support routines that might otherwise live in 
SystemTaps runtimes/ directory.  Another use might be to pass -D define 
options.