This is exactly my thoughts. They call out markerlights, why do that instead of saying any special abilities.
Probably because 90% of the time this is going to be a reason to combine fire, especially when only combining two units. All the fuss is over combining the commander, which they didn't specifically call out in the rule.
Wrecking Crew Member
I would punch his baby in the face! thats how i roll! ask around, it happens! ~spines