Multi-year user here who still loves the power and functionality that S3D offers. I'm looking forward to V5 and am happy to pay for the upgrade.
One request, whether for 5.0 or 5.X ... "quick edits."
Right now to change even a single setting in the process menu you have to click into the process, click the relevant tab, then change the metric. This can stay as-is, but could be supplemented by a right-click on the process that would provide a context menu with each of the tabs listed and settings (some or all - perhaps user selectable) readily changeable. This would make small tweaks much easier and save a fair bit of time.
Something similar - the ability to make the same change to multiple processes at once, e.g. adjust the layer height from 0.2 to 0.32 for 5 processes at once.
Perhaps this is an edge case, but appreciate your thoughts.