NO!
I have installed more plugins then You have.
Now, in menu bar of SH3D, You must find:
Menu bar Plan -> Connect walls.
To use this You must have some walls draw in plan.
Remember ALL walls have a start point and an end point.
You can connect the end point of FIRST selected wall with the start point of the SECOND selected wall.(use Shift for this).
Make some tests on a mew plan to learn how it's work.
Their is more tricks to discover like 2 clicks.