Re:
> Filleting improvements are not looking likely for v4 unfortunately.

Oh my, please don't say that Michael! Anyone who tried to use Moi, especially after trying other solutions out there like Fusion 360, almost immediately notice that fillet is not as good, slow on more complex stuff or/and very prone to failed calculation.

Beside Moi being x64, filleting overhaul was what i was looking forward the most!

Please consider it as part of v4. You doesn't have to get on it right away so you can first work on, as you said, grouping, instancing and dimensions...but please consider it as high priority too since it is one of the most used features. When i see what Fusion 360 can handle like self intersection of edges, disappearing fillet (when fillet goes into a poin) and some other very complex stuff Moi fillet just fails without even trying to calculate...huh

One the side note: Would be awesome if you can fillet multiple curves at once too insted of selecting one by one.