The Rainbow Astro RST-135 and RST-135E mounts allow for a 5-point star alignment model, calculating 6 alignment parameter errors. 
The current INDI driver does not seem to sync its plate solving results to that 5-point alignment model. Instead, only the last sync seems to populate an RA/DEC error value.
For a future update of the INDI driver, it would be great if the 5-point star alignment model could be populated using the plate-solve/sync cycles of KStars/Ekos.
 

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