1. How about adding in some plate joints when mitering.
2. It would be nice to have bar grating as an option in Content Center and when using the Frame Generator.
3. An quick way of creating industrial stairs, for platforms and catwalks, made from bar grating stair treads with the nosing already on them.
4. Maybe an automated handrail command. It could automatically build the top rail, mid rails and toe kicks per the ANSI standards for platforms and stairways.
In general, there needs to be a lot more structural steel component automation. If it can be done in AutoCAD, why not Inventor? Companys that design complete equipment with steel structures could benefit from this.