Indeed, Seestar automatically removes certain problematic frames, such as those with star trails or satellite tracks, during mosaic stacking. However, this process is fully automatic and cannot be manually intervened. If you'd like to manually select and remove problematic light frames, you can use software like DeepSkyStacker (DSS) to eliminate unwanted individual frames before stacking, which will improve the final mosaic composition.
That being said, your suggestion is indeed valuable—if the Seestar App or ASITools could offer the ability to manually select light frames for stacking, it would be a great improvement.
