Chaining cancels is only used for jumps where you have to cancel more than once in a row (floor and water inverts). As far as I know I'm the only player who does these jumps that way (basically because I'm the one who came up with this method) and since my cactus cancels are too high because I have a shit keyboard. Chaining cancels is definitely a lot harder than cactus cancelling and noone (besides me) uses it. Wouldn't recommend it unless you have a shit keyboard.
For inverts or double inverts, it's actually a lot more complex.
Nope. 2.xxx inverts (till 2.375), double inverts and 1.5 inverts can be done even without cancelling (if you can 1frame with your keyboard) and you don't need to chain cancels for that, you can just single cancel with rebinds. As I've said before chaining cancels is only used for floor and water inverts.
Also, if you have any questions about how to add rebinds, how to cancel with rebinds (it's slightly different than cancelling with a standard keyboard layout), how to cactus cancel, how to chain cancels and everything related to jump ancelling just add me on Skype (username is JGBMaster, the one with the Spanish flag).