I think the current behaviour of saving a new version of the material by default is probably a good idea for safety, but it would be really good if there was an option to just update the selected material. Otherwise you have to save a new one and then delete the old and rename the new one to remove the #3 etc.
For such a fast renderer, little workflow improvements like this are actually more of a big deal than they might seem..
Thanks
Edit: maybe something like that? (attached)