Request to either disable this shortcut to avoid accidental quitting of TS2, or to make the shortcut a user Preference (e.g. ⌧ Disable ⌘-Q for Quit.
Yes, it does quit, but only if it’s the active app - and I think that would only be when you are in the about or preferences panels.
Is it much of a problem for you?
Nothing life-threatening. I do tend to dispatch utility windows with a cmd-q as they tend not to be used often, and then find TS2 doesn’t work 
Also some apps, such as Skitch, can be quit while leaving the menu bar item active and invokable, so that reinforces the cmd-q habit. And finally, it’s just good ol’ Mac UI tidiness: show your shortcuts, or don’t have ‘em.
For sure I agree it’s wrong, indeed we will fix it. In fact it was an unintended side effect when we made sure that we supported cmd-W to close windows.