Hello Wolfgang,
It is indeed logged as an enhancement request, and I know quite a few people would appreciate that functionality, so hopefully it will be included in a future release (but I can't absolutely promise, or when that would be).
Note also that in Hauptwerk v5+ if the relevant rank is routed to a bus on the "General settings | Audio mixer" screen that has an impulse response reverb applied then you could adjust the delay via the bus's "Wet pre-delay (ms)" setting.
Jerry Martin created some free impulse response files that simply add delay (without actually adding reverb) here: https://forum.hauptwerk.com/viewtopic.p ... 69#p155268