Branches are an absolute must, tees or not. If the user doesn’t specifies a tee family in the style library (need to add a tee selection menu there) then pipes would intersect to simulate a welded connection. Notches in the larger pipe diameter should be added automatically if user settings “notch matching branches” in style selected, just like in the branch fitting author dialog. I’ve never used a cross (too expensive, company standard to avoid them) so I can’t advice on those but on tees if you have three lines with end points coincident, two of them collinear and third perpendicular (or 45 for Y) then that’s a tee connection. At least give us the option to connect them and manually place the tee, right now it complains about branches not being allowed, so you can’t connect nodes. My work around is to dimension nodes at a distance but the sketch is not fully constrained and the route segment can jump since more than one solution exists.
@dan_szymanski