I do a half-baked version of this in Simpleton, as well.  My record and
playback/networking vector storage is the same as my sequencing/pathing
vector storage, and I use the same serialization/deserialization routines
for save games, map files, and map state files (i.e., saves the state of a
map when you go to another map).  As long  as you keep things consistent, it
works a treat.  Just hit tab to enter edit mode, do stuff, test it, tweak
it, test it, play, save.  :D
-- 
Andrew Ulysses Baker
"failrate"