system updates, as affected by securelevel

[Darrel]

With OpenBSD securelevel=2 I can install a kernel, make build, and
install programs which are compiled using Systrace.

What is the highest securelevel that I can configure on RELENG_6_2
which will not affect compiling and installing; e.g., perhaps not
much local difference but having to reboot for a firewall change?
This installation is new and the AUDIT option will be in the kernel.

Thanks,
Darrel