I've got a new concern.
Freeform combos seem to be VERY persnickity about whether they're touching an attribute changing FFC or not. For instance, if the FFC is moving sufficently fast, it can blow right past them without even registering. Some of this sensitivity is nice, as it allows you to set up complex "figure 8s" and such by slightly off-setting one portion of the figure 8. But it makes complex movement that isn't horizontal or vertical a challange.
Second, FFCs seem to act bizzarely when you full-screen warp to the screen they are on. For example: I have a room set up surrounded by traps. Link steps into the room and he's instawarped to a boss room where the traps are supposed to slide into the center and back out ala' the boss of the Dark Woods in LttP, Mothra or whatever. What actually happens is they trigger immediately, without waiting the 250 ticks or so. One of the traps even ignores the att chg FFC that is supposed to make it return to the border, and shoots off to infinity. In the editor, they behave appropriately, sequentially moving in and out.
Some scripting can probably replace the use of att chg FFCs, but they're so simple to use that I'd rather they worked predictibley.