I carried out a short trial run on M99 in EQ mode using my S50, imaging using Live stacking and repeating with Continuous Capture mode and using the Deep Sky Stack function to stack continuous images. I picked M99 as it had the lowest declination at 14 degrees visible from my back yard. I used a 30s exposure time and wanted to see which mode stacked the most frames. After polar aligning using NINA and checking with the Seestar App (0,0) I imaged for 1/2 hour with Live stacking. In that time the S50 captured 55 frames and stacked 17 of them, a 31% stack rate. I then took 55 frames in Continuous Capture mode and stacked the images using the Deep Sky Stacking function. DSS stacked all 55 frames, so 100% stack rate. The DSS image did suffer from elongated stars which could be corrected using the aberration removal and sharpening tools in Siril, to give a decent final image. With 55 frames the detail wasn't great but the concept worked in that if you wanted a better stack rate, using Continuous Capture with DSS may be a viable way to go. On another object M63 with a declination of 41 degrees, Continuous Capture with 20s exposures with DSS stacked 97% of 708 frames. Using a stacking script in Siril on the same frames yielded a stacking success rate of 59%. It appears the DSS is more forgiving. The one drawback I noticed using Continuous Capture was that when all the frames had been captured the Seestar does not switch itself off and the arm stays up.
Overall, I think I would stay with a low exposure time of 10s with low declination objects and get sharper stars using Live Stacking then relying on post processing techniques to compensate, though Continuous Capture remains a viable alternative at whatever exposure time you use if frame capture rate is important.
