Last I checked the timeline wont do decimal point tempos via midi clock (unless there has been an update I missed), just whole numbers.
You could probably work around this by using the auto tap macro and a function jack. you will need to use an additional cable to your timeline. Its definitely hassle unless you REALLY need those decimal points. Essentially the PBC will tap for you, so its not instant, since I think you need 3 taps. In most cases it would be pretty hard to hear a .5 BPM variance on a dealy BPM, especially since my picking hand is probably off way more than that, haha.