It seems that there should be a way to
program a macro to do as you're saying, but
there may also be a hardware way to do this
with current X-10 products. If there are low
voltage terminals on the base unit that can
be accessed, you could order a PowerFlash
Interface (PUM01) to do as you want. It has
low-voltage terminals that can be used to
trigger an X-10 power-line signal, and can
be selected that the resultant signal be an
on/off one. I'm going to research this more
and see what I can figure-out. I've got that
same alarm system, but haven't had a chance
to install it, yet, so I am still a little
unfamiliar with it.
I thought I had a way to trigger an X-10
power-line event with this and another x-10
device, but it was going to end-up being a
Rube Goldberg contraption. However, it would
have worked and would have translated an X-
10 power-line event from one house code into
an X-10 power-line command on a different
house code, and would have flashed those
lights without the use of ActiveHome.