Two years later and still not added,
... and no response for over a year.
"Having recently assigned routes is planned. Expecting to have this feature implemented this summer."
-- Any updates on the enhancement requests for (a) Recently assigned routes / preferred routes or (b) routes entered manually by users?
Both (a) and (b) have been industry-standards ... for quite some time: skyvector, Garmin Pilot, 1800wxBrief.com, etc.
Customer support service by UserEcho