Changing psm (mouse) resolution?

[Ronald F. Guilmette]

The man page for the psm driver says:

    ... The current resolution can be changed at runtime.

Unfortunately, it fails to mention any sort of command line utility
that would provide this functionality.

Is there a command line utility that provides this functionality?  Or do
I need to write one from scratch, using the ioctl calls that are documented
in the man page?