Yes, that is an issue with our development logistics and need to focus on the new version with a unique interface vs. pushing this to older versions each with their own considerations. In this case, 5.2 can't be fixed the same way we did for 5.3 in this regard. In short time I'm sure we'll be on to a new version with this resolved and newer issues to consider.
The 5.3HF1 stuttering issue, based on all the info I see, is related to either an incomplete/invalid update/installation of P3D, scenery add-ons, AI traffic/environment/road traffic overload, or general overload influenced by options (such as Autogen Draw Distance), or specific .cfg adjustments which are problematic. I'm sure it will be sorted soon for those that are still experiencing it. In the mean time I highly recommend isolation testing ASP3D 8042 just posted, and vanilla P3D 5.3HF1+ full re-install with options low, then move things up/add things slowly until you identify what is causing the issue on your side, then you can avoid that option/item with everything else running appropriately.