I do plan to add part editing support to some degree at some point, mostly because I might want to take a shot on creating parts myself some day. But there are many features I want to add first (like flexible parts, minifig generator, auto snapping etc).
Also a while back Nils Schmidt announced his plans to create a pure part editor, and him being a part author he probably would do a better job on it. See this thread:
http://forums.ldraw.org/showthread.php?tid=4918,4918
Also a while back Nils Schmidt announced his plans to create a pure part editor, and him being a part author he probably would do a better job on it. See this thread:
http://forums.ldraw.org/showthread.php?tid=4918,4918