I don't feel that the CandRsymmetry package belongs in the core release of SpinDynamica, which is intended to be as general as possible.
Nevertheless there is certainly place for "add-ons" which can be released alongside SpinDynamica and which use its functionality. For example, "add-ons" are badly needed for pulse sequence implementation, relaxation superoperators for relaxation models, etc. I am hoping that in the course of time other programmers in the NMR community will create such add-ons and distribute them.
Unfortunately, right now I do not have time to resurrect and release the CandRsymmetry package myself.
all the best