I remember back in the days on one of the beta version of rhino5, by typing
MeanCrv; you get the average of 2 curves which is very useful, now is no longer available.
Axono: you can get the axonometric view straight away in parallel projection, rather having to build a curve and then set the camera which is a very cumbersome way. You can get that view last time by just typing Axono. Where are they now?