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I am not a specialist but the way I understand it game companies like crytek allow modders to use their engine for free because that makes their game/engine poplar and prolongs the life of their product. Hacking around and make it look less like a mod won't make crytek happy.
anyway, installing crysis is not such a huge effort. I think we are fine as a mod.
Not sure if it's possible, let alone legal ;)
I am sure crytek won't be happy with such actions.