There's a little annoying problem with keyboard shortcuts but I'm not sure if this a Sweet Home 3D or Pan3Dview problem. When you select a single object in the 3D view the keyboard combo ctrl+E works to get the modify dialog but not if you select multiple objects in the 3Dview. With walls and ctrl+shift+E the modify walls dialog does appear with either one or more selected walls. The same should happen for normal objects.

I think it's simply a missing keyboard event. If this is in Sweet Home 3D it's an easy fix to include in the next 7.3 beta.