Great write-up, Thorsten. There is a whole other set of options also. I don't know if they are close enough for you to include, but it's worth pointing them out.
These are in the general category of Org annotations. Instead of editing Org in a temporary buffer, you use a real, permanent Org file (can include an agenda file). There are two types of options: those that allow you to use Org to annotate external files without changing those files, and those that allow you to annotate external files by putting persistent markers in them. In both types, you can in principle do C-c ' to get to your Org agenda files location from your external files, and the same thing in reverse. The existing mechanisms include org-pua.el, org-registry.el, and org-annotate.el. In principle, you should be able to annotate web pages in w3m.el and dired entries and info notes also. To me, there is a lot of possibility here. It should also be possible to put an ID marker in an external file, which corresponds exactly to the Org IDs in a canonical entry in your agenda files. Then C-c ' can bounce between the external file and your agenda file. Samuel -- The Kafka Pandemic: http://thekafkapandemic.blogspot.com The disease DOES progress. MANY people have died from it. ANYBODY can get it. There is NO hope without action. This means YOU.
