Yeah most or some of these CAD clones cannot handle lisp. Some can but they are still limited as to what they can offer while a few do have a few bells and whistles over ACAD. The ones built off of IntelliCAD are not bad programs and can work if you need a cheaper alternative to real ACAD. There is no easy answer for you though. Try it and see if it will work for you, that's really the only way to know for sure.