I feel that Excel is also a more important part of the collaborative field. And also a complicated proposition. Is anyone interested in this area as well? Will the author consider doing something about this?
I am not sure what excel-based collaboration is. But regardless, it doesn’t sound like something that should be part of the core library—if you’re writing a plugin for it, and are having trouble with some part of the interface, let me know, and we can see if we can work around it.