First look at the main toolbar for the plugin:

1.) Draw Floor
2.) Edit Floor
3.) Move Floor Edge
4.) Edit Rim Joist
5.) Engineering
6.) Global Settings
Most of these tools are fairly self explanatory, number 4 is probably the most interesting. I will allow the user to customize each rim joist per floor edge (if desired), or remove it entirely. This will come in useful where there are multiple floor assemblies abutted next to each other.
There will also be additional context menu tools (ie. regen floor assembly). One context menu tool I am thinking about adding in is a way to select a given edge as the starting point for the floor joists/trusses. This will allow the direction and spacing of the floor joists to be aligned to any edge along the floor outline.
There will need to be another completely separate toolbar and tools that deals specifically with holes cut into the floor.
Lots of little details to still work out and even though much of the code base can be recycled from the other plugins there is still a lot of work involved to produce a completely new plugin with the capabilities that I envision for this new architectural tool.