Thank you for responding to my question;
So that option only applies to Geometric Selection mode, where you select multiple surfaces, you right-click and hit that option to add all the faces/edges to your current selection. That is also fine in theory, since the Inflation layers technically do have a Geometric Selection option, however unfortunately, if I select the different parts geometrically, every time I try to mesh or to preview the inflation, there is a "Sweeper Seed" error.
Here is the complete wording of the error as presented by the Meshing software: "The mesher was unable to create the source mesh to seed the sweeper."
This happens regardless of the options & parameters I have selected for the Inflation layer, and what originally lead me to believe that there is some sort of bug at play.
Sincerely Svarun