how to set time in trackers and patterns

Tracker and pattern objects in blue are great, it was pretty hard to really compose anything in csound before, when you had to manually write the score. But I couldn't find a way to arbitrarily set the time for each note or each beat. The only solution I found so far is to change the number of subdivisions (for the pattern objects), and to rescale the object (for the tracker). For example if it has 64 notes and I set his length to 16sec. (with the rescale property) each note will last 0.25s.

The problem is that this isn't that comfortable, especially if I want to experiment a bit, add, or change something. It would be much easier just to be able to set a new time-for-one-note in the tracker properties.
I suppose there is a way to do this, but I cannot understand how.