SoThink SWF Quicker is the only lowcost flash suite i know of that is fully ActionScript capable. Everything you can program in Flash works with Quicker as well, at least what i tried.
and yes, it seems to be completely reverse engineered, but it provides a great feeling... i like it, and believe me, i tried almost any flash package on the available on the net, koolMoves, swish, coffecup, flash creator, and many more. none of them offered a usable timeline with complete AS support. and it costs only a tenth of adobe's pack...