You could try
Animation Shop, from the Paint Shop Pro suite... it does the 'edit the frame not the layer' thing, but then it doesn't do the 'make one layer and move it all over the place' thing AFAIK which is what makes IR more useful IMO.
/acronymsanonymous
(
JustHere4Coffee remembers when all o' this were car parks,
Fri 4 Apr 2003, 21:21,
archived)