Andrew,

At present QCAD/CAM the tool drop-down box displays tool number and diameter between brackets.

It would be more appropriate to display if it is a mill or a drill and/or the description of such.
In a further stage of development ball-nose ... Conical ... And so on.

I have several specialized mills with the same diameter.
End-mills, roughing mills, routing mills, face mills ....

Tools 1(ø6mm) or 2(ø6mm) don't say much if tool 1 is a side-mill and tool 2 is a high speed drill for metal.

Related forum topic:
https://www.qcad.org/rsforum/viewtopic.php?f=31&t=10722

Regards,
CVH