Please feel free to correct me if I'm wrong but would have thought that the C-max will have an hydraulicly actuated clutch? How much free play/travel in the clutch pedal have you lost? I very much doubt that the weight of the pedal will actuate the clutch master cylinder and if you pull the pedal away from the master cylinder plunger does it extend out any further? If not then the release bearing will not come back any further and you will do no long term damage.
I'm thinking you are right. The remaining free play taken up by the spring takes it less than half an inch off the plunger. It just sits happily on it and as it is a plastic pedal arm there is very little weight. I think coffeking is right that it would maybe only become an issue if you rest your foot on the pedal a lot as it now rests on the plunger rather the force provided by the spring.
Which spring broke? the return spring or the assist spring?
To be honest I don't know. It didn't have a name, just a code. It's very similar to these….
One end sits in a recess on the upper end of the pedal. The other end of the spring attaches to the pedal backplate somewhere.