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Hi Martin,
I’ve seen a few QE graphs for CMOS and CCD and there was still a non negligible amount of sensitivity past 800nm for I believe most if not all mono sensors. Therefore I suspect an IR filter is a must to minimise bloating. I have little experience with OSC (used only in early days of my astro adventures), but if a manufacturer recommends IR filter then I would use one for the same reason as for mono.
Having a telescope corrected for a wider range of wavelengths IMO should result in sharper DSO images, even in narrowband imaging, since no filter blocks 100% out-of-band light. If RASA brings a wider EM spectrum into a focus, this should be helpful for sure, but I would be using filters as normal, if chasing perfection.
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