New to Millumin - cutting up a >4K raster for transmission to a NovaStar system with no artifacts
I'm new to Millumin and I'm trying to execute something fairly straightforward. I have a raster that's 5760x2160 that I want to chop into  4K raster and  HD rasters for transmission over HDMI and then re-assemble it on an LED wall into a single seamless image with no artifacts. I need pixel-accurate Region Of Interest control and output mapping control. Everything is perfectly rectangular and 16:9.
I'm wondering if someone can point me to the right screens to execute this. I found output control, but couldn't find how to apply it to ROI. Is that under "slices"?
Also are there EDID management tools in Millumin, including custom EDIDs or EDID emulation? There are devices between the Millumin PC and ultimate display which may drop EDID. I need to lock EDID at the source if possible.
Additionally, is there any sort of image synch option to prevent tearing. I believe mac gpx cards have the capability for image synch, but the controls are locked down at the GUI layer. Does Millumin have a tunnel to that control, or some sort of internal SMPTE timecode capability?
Thanks very much, and if this is all in a manual somewhere, feel free to google-slap me.