Quote; "Sometimes the return leg is very close to the outward leg and so that the area notams reappear again and hence the forest. With a graphical plot they only need to appear once. "
So, submit the request as though it is just for the outbound leg, but make sure the time period covers the whole flight time plus a bit, and just get them once. That's what I do.
The whole process takes me less than 10 minutes including editing down the returned list which is only about 2 pages-worth anyway - hardly what I call a forest. Sometimes I do two - one for the general area my gliding club uses for local soaring/bimbling, for which I normally edit out all but the most local nav warnings (we are rarely interested in RAC, Comms, etc.), and another for long out-and-return flights for me and one or two others. The second takes much less time than the first because I can delete all the repeated RAC and comms etc. stuff without reading them again.
Chris N.