To my opinion one thing that is needed urgently -I have said it in another thread too- is a deforming by cage! It is a very needed feature. It is really a problem to go back and forth by exporting importing an object for being able to deform it in another app.

As to other needed features I do double the thoughts of Metin. Having a good quad (or even hybrid) mesher for obj export would be great. The present exporter is good but if you want to send the object for sculpting there arise a lot of problems: especially the fact that there is a so dense accumulation of polygons on the fillet areas makes the remeshing in other apps difficult. It would be great, indeed, to have an alternative way of exporting the models by shaping on them a more suitable for sculpting mesh.

And... a simple, nice scroll where the user could insert, with icons of his own design, the add-on scripts please... most of the add-ons are very useful and it is difficult to remember them by keyboard shortcuts only.