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You can modify the properties of particles, which are stored in the DDDB under param/ParticleTable.txt. This can be useful e.g. in Gauss.
This example is for Gauss v40r2p3. In Gauss-Job.py (or similar, write):
ParticlePropertySvc().Particles = [ "K*_2(1430)0 153 315 0.0 0.100000 1.0e-10 K_2*0 315 0.0", "K*_2(1430)~0 154 -315 0.0 0.100000 1.0e-10 anti-K_2*0 -315 0.0" ] ApplicationMgr().ExtSvc += [ ParticlePropertySvc() ]