One should not forget that C41 is a process targeted at optical enlargement of the resulting negatives, which means many corrections that are trivially applied in digital post processing are not considered when judging C41 negatives. As difficult as it may be to process C41 to match Kodak's criteria, if you scan your negs you can get away with all kinds of processing errors, and let's be honest: most of us who shoot lots of C41 do scan their negs.

My recommendation to the thread starter would be: First, do C41 according to specs, which are whatever the instructions of your kit say. Once you got the process figured out, and if processing at room temperature saves you a lot of hassle, you can always try a test roll and see whether you get useful results.