That can all be done with a mod... a new main.scm to be more spacific...
The mod I currently have running with Vice City is "Ko-Gars' Multi-Mod v4,657.900643 (Beta)" When you start the game it gives you $100,000, 200 health and armor, an uzi with tons of ammo, while you are in a vehicle it becomes EVERYTHING PROOF, plus a bunch of other things.
It doesnt seem like it'd be too hard to make a mod that does everything you asked for... But even without making a whole new main.scm you can do some of this stuff...
default radio stations are one of the things you can edit in the default.ide file
Weapons are editable in the weapon.dat
Good handling is editable in the handling.cfg
You can lower the damage taken by all the cars in the handling.cfg too.
Probibly one or two more of those things can you want could be done without actually working with the main.scm also.... And thats w/o using the codes
My only problem with all those suggestions is that they would make the game just plain no fun... Sure you could go out and kill indescriminately... but I've already grown very tired of not being able to destroy the car I'm driving with the mod I'm using right now. And half the fun (to me at least) is to see how long you can last before you die or get busted while destroying everything...
Plus there is still the fact you can use cheats to do 7 of those things to some degree. (refill health/armor and repair vehicle instead of unlimited/indestructable)