That makes sense. Multi-UV map support is possible in other plugins (Octane, if I am not mistaken, can natively support up to 3 UV maps). The only thing that will hold Multi-UV support back would be - as it is in all cases - based on the limitations of the host application (Blender in this instance). I will look into this as best I can to gauge feasibility. Based on user demand, this will determine how highly this is prioritized on any future roadmap.
Thank you for looking into it.
There should be no limitations from Blender side of things. To me it seems that multi UV support is just not added to Octane plugin, cause whoever programmed it didn't get to that part YET or whatever the reason was. The Octane UV node is there and is called "Octane UV projection". It just doesn't have the UV's listed to select from. So its kind of halfly done already.
I'll add 2 screenshots for you to explain better. (one from Cycles and one from Octane)
For my studio this is the highest priority thing and we can't use Octane for Blender because of it.