It would be nice to able to pick an alignment point for a given beam inside the beam system, and use the spacing settings to space off that point.
For example - I know I have a beam system with beams spaced a 18" o.c. I also know that beam #3 aligns with a wall in the space. It would be nice to set that alignment and have the beam system build itself with that as the "origin," rather than having to adjust the boundaries of my system until I get the alignment I'm looking for.
This ability already exists with things like hatches/fill patterns, so, for example, I can adjust my reveal pattern to line up with the bottom edge of a window by using the Align tool.