I would love the option to select which layer(s) to trace when multiple layers are visible.
Example: I am updating an HOA polygon to better follow parcel lines. So in my map I have the current HOA boundaries plus parcels and other reference data such as creeks, streets, and alleys. When drawing a new boundary I only want to trace parcel lines. But because I have other layers turned on for reference I constantly have to fight which line the trace tool follows.
Ideally I would like a section in the Trace Options dialogue box that would allow you to check the layers you want the trace tool to use.