external ? hehe... if it was possible to disable recoil and spread by just changing a few values in memory I'm quite sure VAC will scan these addy's
Most external stuff are overlays of values read from the memory. though as spread and recoil (CSS specific) aren't disabled by changing your memory, like in some simple noob games changing the 1's to 0's won't work in css.
Unless an experienced repped coder proves me wrong you'll have no chance.