they dont have any info on c_move and c_trace because there is nothing new on them. c_move and c_trace are still used (look in include/afuncs.h to see a list of functions used).
i like being able to give physics a go (normally only have extra edition) however, physics isn't best/fastest for all situations.
yeagh physics , or if you want an optimised thing and only collisions for a game thata don't need physics : action/adventure, shoot em up , etc ... you can use Opcode library or another.