Therein lies the rub — AutoCAD cannot create Truetype fonts. CorelDraw 3.0 can — that was the first program I used for editing Truetype fonts, but it was very hard work. Each character had to be exported from a single drawing to its intended position in the font. There was very little control over metrics, naming, platforms, etc.
FontCreator is not the ideal program for drawing contours, but it will gradually improve as the years go by. As Erwin says, the next version will include import for EPS, AI, and PDF. Importing postscript outlines is many times faster than tracing a bitmap or metafile. However, drawing programs and Truetype fonts use different kinds of curves, so imported curves will never be point for point identical, even if the import works perfectly.
See Chris Eller’s excellent post on Quadratic (TrueType) v. cubic (Type 1) Bezier curves