I forgot to add ... I've noticed that with the newly released Lansweeper that {MAC} is only available when you apply it against a device but not when you attempt ot use it for an action related to a PC.
It's not even listed as an option. I wonder if this was an oversite?
{actionpath}, {smartname}, {assetname}, {dnsname},
{computer}, {domain}, {tag}, {username},
{userdomain}, {ipaddress}, {fqdn}, {scanserver}