It was probably a "bug", not a "feature". They have done several bug fixes on stars since then. Notable, T Tauris now resemble "proper" stars rather than White Dwarfs, and certain stars (was it AeBe Herbigs?) which were rendered as rotating very rapidly now rotate at their correct speeds.
The only stars that "pulsate" now are neutron stars. Neutron stars in binary systems can have really wacky, super-fast rotation that makes their jets look like giant fluorescent-blue bow ties. But this isn't a game glitch, this matches what's actually out there in the universe.