I have a number of GE 14294 dimmers, as well as several other dimmers. I had some scenes set up with durations for them to come on, and I noticed that the other dimmers slowly changed to the desired level, but the GE dimmers switched instantly.
Then I went to the device page for one of the 14294s, and tried the setLevel command with a duration. Even there, the change was always instant.
Do these devices just not support setLevel durations? If not, I know I can write code or use RM to fake it, but it would be so much easier if they behaved like the others.