In the MIDI editor you can make the grid follow any subdivision. Example: To make a precise 8th-note septuplet starting on the first beat, divide the bar in 14 by putting 1/14 in the Grid dropdown. (If you want one of these tuplets starting on the second beat, divide the bar in 28 instead)
Could be a bit more intuitive. Still, its possible, which is not the case for some other hosts.
(took the liberty to add this to the google doc. Thus, your downloaded versions are already outdated
)