I can see a pay-off of time and temp if it allowed you to develop C41 at room temp which in the U.K. even in high summer might only be 80F and in other seasons a lot lower and my understanding is that crossover issues would arise at these temps. If you need a water bath such as the Jobo processors have then you might as well do it at 100F

Can the OP say whether he gets normal colour negs at 70-75F?