Just found this thread.
Would appreciate in V4:
- Fillets and chamfers improved. So in case they should overlap they don't 'crash'.
- File type import/export expansion. Mostly OBJ and STL.
- custom commands and scripts. Could be made so user can place own buttons for each inline script, or command.
- ability to create lithophanes. Something like hightmap script from Max.
- set object partialy visible (opaque)

Surely it's up to developers to decide which ones are requested most and what kind of programming is needed for implementation.
I'm patient :)