The newsreader which allowed me to choose a server when loading an NZB file was Grabit.
Alt.Binz appears to have a number of advantages over Grabit, tho I'm not yet as familiar with the former. I'm looking for Alt.Binz tips to address some of what I miss from Grabit, after which I may fully switch over (and contribute, as I did for Grabit). I'm just trying out Alt.Binz for now, to get a feel for what it can and cannot do.
Besides the approach I mentioned above (for older posts or missing newsgroups, just let Alt.Binz try every article on the faster server which won't have it before falling back to the slower server), if one wants download ONLY from the faster or the slower server, one could open only threads for that one. My problem is that I want some nzbs to download slowly from the more comprehensive news server (using 40% of my ISP's bandwidth) while others download from the faster server (using the other 60%).
It would be great if a given download could optionally be associated with a given primary server (plus fallback secondaries). This would be a feature like optionally selecting a per download folder. Only threads for that primary server (and secondaries) would respond to that download. If none was specified, then any thread might try to service the download as now.
Zeph