Describe the suggestion
A command which would allow to place IR tracks with commands. Something like this:
\IR-set-track custom_curve_branch <xyz1> <offset1_xyz> <vector1> <xyz2> <offset2_xyz> <vector2> <xyz3> <offset3_xyz> <vector3><gauge> <style>
(Where offset_xyz is like when manually placing and its not constrained by block spaces)

Applications of the suggestion
There is an algorithmic modeling software, Grasshopper, which allows to design things procedurally. It is possible to transfer stuff made there into MC (by creating algorithm which would convert geometry into text with Mc setblock commands, which then would be run as function). An IR set track command would allow to transfer railway network designs in similar way. And also allow more complicated shapes (in Grasshopper they can be converted into splines with tangents (I assume this is what IR custom curve is) with algorithms so then be converted into IR set track commends in a mentioned way)