Hello Cast007,
This is your typical good news/bad news response.
The good news -
Lightolier does use slave switches for multi-way circuits. It's referred to as a "CPR3" and is shown on page 7 (left side graphic) of the PDF you referenced.
The bad news -
You may have problems finding any of these - particularly for a 6 way setup.
I don't have personal experience with the Compose series, but they were considered rather "high end" for their time. That time has passed and there isn't a lot of technical documentation left.
I found the following on programming:
Lightolier Worksheet
Most slave switches of that era simply toggled the "yellow remote" input to the load controlling switch. This signaled the unit to turn on/off. If that is the case with the Lightolier line, a Leviton MS00r remote
"Might" be compatible. These aren't particularly expensive and are still available (in colors).
Rather than take that risk, and rely on a master switch that really isn't supported or available anymore, you might think about changing t0 the Leviton HCM06 line.
If you are intending to expand your system in the future, I would further suggest that you look into a current communication protocol (ZWave, UPB, Insteon). It all depends on what you are trying to accomplish, and how long you want to maintain this system.
