Can it draw basic stuff like circles, arrows, and lines now?
Line: Rectangle select -> Bucket fill -> Transform
There should be some basic arrows but there doesn't seem to be.
Haven't used Gimp in a long time, but try holding down ctrl, shift or alt while doing the circle (or rectangular for that matter) select.
One is for aspect ratio, one is for center from starting point and the last I cannot remember.
IIRC the same goes for combining selections: modifier keys can be used to add, subtract or make intersections.