Coot is not:
[1] The official CCP4 graphics program (which contains parts of Coot (and Coot contains parts of CCP4MG)), CCP4MG is under the direct control of Liz Potterton and Stuart McNicholas.
[2] although it does have a local refinement algorithm it is no substitute for refmac (a wrapper for refmac is available).
[3] that's the job of the CCP4 Program Suite.