There's is nothing bad about Razer Synapse, except for maybe the amount of time it uses to load up at boot. I've had it for 5 months and haven't encountered a single problem other than the loading time which isn't really a problem, more an inconvenience.
But if you still insist on only using synapse once I'm afraid I'm gonna have to dissapoint you as the blackwidow has no onboard memory meaning that you have to have the app for the color of your choosing to be selected.