Easy one .. All Global Variables available to objects should be available to their associated markers/labels, either directly or as the AC_ blue optional parameters available for subtypes.
I don't know how many aren't, but there are some pretty obvious ones such as this - i just don't understand why they are not available.
cheers,
Owen Sharp
Design Technology Manager
fjmt | francis-jones morehen thorp
iMac 27" i7 2.93Ghz | 32GB RAM | OS 10.10 | Since AC5