Need help with Active Home macro

["Occupant" <occupant@xxxxxxxxxxxx>]

I have a closet light that the family is constantly forgetting to turn off.
It is wired thru an X10 LM465 lamp module(G8).

I tried, and failed, to get Active Home 1.42 to automatically turn the
light off 10 minutes after the on command.  My thought was to have
a macro trigger on the G8-on command and then send the G8-off
command 10 minutes later.  However AH will not accept both a macro
and a device with the same house&unit code.  I also couldn't figure
out how to get one macro to trigger a different macro.

Anyone have a solution?
Or am I attempting the impossible with AH?
Is there a better controller program?

Oscar