Add the ability to intersect either two separate pipe routes, or include an intersection within a single pipe route,... and have Tube & Pipe automatically interpret this as a branch, placing a tee inlne at the intersection. In conjunction with a prior Idea on this site, this could potentially be a reducing tee, which would update the line downstream of the reduced branch.
This behavior would make it much easier to align branches with a piece of equipment while routing pipe. See picture for example. In the picture, the branch off of the second pump would have to be a tee placed inline and would rely on user input to ensure that the fitting is lined up with the centerline of the pump. With this requested functionality, a route line could simply be run from the pump to the main trunk line, and intersect it... placing the tee automatically.