In many cases, the CAD operator will hide the layers containing Datum Axes, Datum Planes, etc. Whilst the layer is hidden, items on it are not available for use as references for other features, even though, by clicking on the item in the layer menu or the Model Tree, it will show up in red in the model window.
Make it possible to use Hidden references for features, but only if they have been explicitly selected in either the model tree or the layer tree.
This could save a lot of time.
For example, I may want to place a hole on a datum plane and co-axial with a datum axis.
If my planes and axes are hidden, I must first unhide both layers, before I am able to use these references. This means that a great many Axes and Planes appear on the screen, so I either have to hide all the individual Axes and Planes except those I want, or query-select through until I find my targets.
If this idea were implemented, I could select the datums I wanted from Model Tree or Layer Tree, without having to unhide them, and without having to wade through the clutter on the screen.