Better scripting support for 'Lock Markers'

I'd like to request a read/write layer property (eg. layer.lockedMarkers = true/false), so that markers on a layer can be locked/unlocked (and the lock status determined).

Currently the only was of doing this via scripting that I'm aware of is with the Command ID (2565), which is very inconsistent. It doesn't always work properly, it seems that it can lock/unlock layer markers but only lock comp markers. Furthermore, markers that have been locked can still be modified via scripting, so it would be helpful to have a way to determine if a layer's (or comp's) markers are locked, in order to skip that layer/comp.