I defintly agree with you about the scripting editor and the workflow in general, as well
The weak points of dxstudio are:

speed
importer

for the former item, it seems that dxstudio has improved a lot, see gri's post
I just tested an old realese and it was definitly slow
for the latter one they seem to ignore the problem but it is a serious one
It is a pain to import even the most common file format