The Roadster 3.7 clutch issue came to my attention when an owner was lent one whilst his Plus Four was in for a brake change. He asked me if it was normal to be that heavy, which compared to mine it was. I'd never had issue with mine but during some pedal and linkage re-engineering I noted that it had no pedal mounted return spring which earlier Roadsters did up to at least 2014. The return action coming from the clutch itself plus master cylinders own internal spring. The second return spring of course adds to clutch pedal heaviness. It's a simple task to unhook it for immediate improvement although removal entails taking out assembly as below.

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The work I did included replacing thrust washers with phospor bronze equivalents, one of which was missing anyway ex factory, plus changing to proper stainless clevis fork linkages on both pedals - note clevis thrust washers which are also not always present ex factory. This improved smoothness of pedal actions noticeably and remains so. Well worth the work IMO.