If I remember correctly VDR supports resume points per client.
I don't think so. All VDR has is a "resume" file which is placed next to the other recording files: http://www.vdr-wiki.de/wiki/index.php/Resume
It stores a frame number and only one per recording.
I guess this feature is especially useful for people not using VDR exclusively with Kodi as it allows to watch with another client and have the playback progress synced with Kodi. "Full Kodi users", like me, would probably prefer to centralize the whole Kodi database which would include VDR recording progress. But so far I actually have everything on one PC without any client server structure. I don't have many recordings and have stopped to record new stuff long ago. I prefer to use streaming services and have a separate DVD/BluRay player for the movies that I buy.