The line/curve mode should/could be the default mode instead steps, just as in any other DAW. Since Renoise now has a powerful curve feature, I think there is no reason to still keep steps mode as default.
Line mode already is the default mode, but it switches to steps when recording automation movements, because such movements are done in “steps”.
Well, I had some newbie question regarding automation recording: “why it sounds so steppy?”
What about a setting? Because I would be interested in line mode also for recording, too, since this also is normal in Bitwig or Cubase, so I guess it is what a newbie would expect. I think the step mode actually is a pretty specific exceptional case.
That also confused me first when recording automations.