The alternative wouldn't be clear for legs that are partly in a climb/descent and partly in cruise, and it's also not clear even for legs wholly in a cruise or descent because the TAS will vary over the course of the leg as altitude is gained or lost.

Dear Sky Deamons and pilots,

I have the problem, that I defined for my aircraft two cruise-profiles (normal and fast), as well as climb and decent profiles. If I plan a route now, my three first legs should be climbing, which is shown in the altitude profile in the bottom, but if I create the pilots log, the Altitude is always given with the altitude of the final cruise altitude, which is reached only 2 legs later, and the TAS is always given in cruise speed, although it should be slower in climbing. I would expect SD to insert this automatically, but I cannot even manually change the leg to cruise. I can only chose there between the two different cruise-Profiles. Why is that? And is there a way around this?