Hi Steve, that is great news!

So for the next beta the IGES export will be tuned up to do this by default - it will export lines, circles, and arcs as those specific kinds of entities in the IGES file instead of as generic splines.

If it causes any problems (not likely but just in case), it will be possible to turn that off and return to the old behavior by editing an entry in the moi.ini file:
[NURBS Export]
WriteAnalytics=y

Later on at some point this will happen for STEP as well.

- Michael