I use IFPUV every time I do a planning.
However, I didnīt know:
It WILL let you put in ADEP- DCT- ADES and then it will supply you with the correct route to file
and even after trying hard for the last 30 minutes I canīt get it to work the way you describe it...
What I can say though, is that the route catalog provided very often does not help for flights from regional to regional airfields. I often wondered why accepted and acknowledge fpls are not added to the route catalog ?