@Dumbo. You can try all you want. Then you wake up with robotic bits anyway. That's ER for you.....
On the subject of new systems. Yeah, go for your life PW. It's your game. However much re-statting and remechanicing you want to do is up to you. I will say something for the current system though. It works, and it works pretty well. RPing and basic actions don't need rolls, other ones do, but we don't know the modifiers in play anyway, so from a player perspective it's fine. Post action, see result of action. It's a great system.
On dynamic bonuses, I'd prefer them to be the same as they are, but the player has to be specific on use. Prepare Con bonus by readying my rifle and looking for any targets on the horizon is fine. Imma charging my Exo bonus isn't. Imma charging my Exo bonus to heat an area/use against the Eater/prepare for incoming enemies from the north is (one of those three, not all). A bit of specifity to explain the action gives both a reason for the bonus, and explains what a character is doing.
For amps/manips, it shows that you're pre-calcing an effect/area/target/type of amp to be used. For con weapons, it gives a stance or area or target. Even for ephemeral things like Will bonuses, it should be specified (I'm charging my will bonus to ward off possession is fine, but you won't get the bonus if you have to do a Will roll for something else). Readying an Uncon bonus could be "Ready my Uncon bonus as I prepare to slice his head off with my mono-razor", you're not going to get it if you decide to use explosives or a manip next turn. Maybe being really specific with your readying of bonus could give a better bonus, while fairly general readying gives imperfect decompensator levels of help. If target, or use, or weapon, or area is specified, then a decent (current) bonus could be given. But regardless, it should be posted as a part of an action. Readying a bonus isn't an action in of itself, you just can't do much else while you're doing it. Give a reason for getting the bonus and it's fine. Imma walking, talking and chargin my Con bonus is a pretty shitty reason for getting the bonus (that's all we do half the time anyway. Walk and talk). That'd give you the worst decomp bonus, because it's a shitty action and explains nothing.
Take a run-up, flex your muscles, prepare your mind, put on your most shit-eating grin, but do it for a specific purpose. Then these bonuses are fine. It'll also make it a lot better to read, the action more fluid, a heap easier on PW for success/fail states, and we can work out what the fuck other people's character are actually doing (or attempting to do).
Sambo's got three Con weapons. He probably should give a vague indication of what one he's aiming, and maybe a general idea of where, why or how before he gets any sort of dynamic bonus for it. Otherwise he'll just charge away. It's even worse with multi manip or amp users. So levels of bonus, depending on specifity of the readying/charging action seems a good way to do it.