I would go even so far as to add multiple layers for the metronome. For example, the first layer could be quarter notes, the second layer triplets.
It would be really handy if one could specify which notes of the current subdivision are being played (or which notes should be excluded) This would be very helpful for those who want to use Studio One to broaden their sense of timing.
Furthermore, extended tuplets, which are not too common in today's music, could be included (e.g quintuplets, septuplets, or even more complex tuplets). With the metronome, one could train the ability to perform those not too often used rhythms.