The dam timer is only NOT visible all the time because there would be too many events at once, and the events panel isn't scrollable yet. Clearly that's not a long term solution, so in future I will make it a scroll panel, and the dam event will be visible from when you first get there to when you cross it.
Headings for the actions make sense, but then you have to decide whether you're grouping by action type or action location. I suppose I could make it a toggle option.
You have access to rover actions while outside the rover so long as the rover is somewhere enclosed. The idea being that you can have the rover airlock open, coming and going as you please. Whereas when your outside, you have to go through the airlock which takes time.
I did used to disable actions when they couldn't be started. Problem with that is it also stops you adding them to the end of your queue, by which point they may have become possible, and that is far more frustrating. I may look at just disabling the start button though, so you at least have some indication.