Thanks for this plug-in [:)]
Maybe you should try to use buttons rather than forcing the user to enter a value...

1) What is the difference between Duplicate Style and Copy / Paste Style?

2) I had the idea to add a Select all furniture / Select all walls / Select all ... for a long time, but never programmed it because I wonder if it could be really useful. Option 8 is an interesting idea.

3) I noticed that redo wasn't working in some cases.