Hi Gunther, have you considered adding a blended frames option like you have in TLDF ? I was interested in shooting Geostationary Satellites with a star tracker and then highlighting them as they will be the only 'points of light' on the ecliptic which trail. I found this excellent timelapse from Alan Dyer (Amazingsky.com) where he talks in the descripton about using blended mode in TLDF when assembling the timelapse after processing the frames in LRT

https://www.youtube.com/watch?v=BBhB1FRpPDg

Currently LRTimelapse's Render offers the "Motion Blur" option, which is similar but fades the blending over time.
There are solutions like StarStaX that offer more blending modes for such more special use cases.
But thanks for the suggestion, I'll keep it in mind and will see if I can add more gimmicks in a future version.