This guide lets you create starless linear data using StarNet++ and the Heal module. Even if you wish to use StarNet++ on your final image, you will find that using this guide to extract the a starmask, the Heal will achieve superior results when removing the stars that StarNet++ identified.
However the Synth module can physically model and emulate most real optical systems and configurations to obtain a desired result.
Coma or elongated stars towards one or more corners of the image.
The Wipe module is able to detect horizontal or vertical banding and correct for this.
You can convert everything you see to a format you find convenient. Give it a try!