I won't say I want this option removed completely. But I believe that this option should have the option of keeping certain applications prefetch files no matter how seldom you run them and deleting all other non-nominated prefetch files which have not been used for 2 weeks. Currently every time you run this it cleans all Prefetch Files of applications not run in the last 2 weeks. This can reduce the time it takes when running these applications.
I do think that this option should not necessarily be on by default if it is kept as now with no options of cleaning only some prefectch files.
Apart from this aspect this programme is great. Too bad the software writer won't listen to reasoned arguments about this option. I think the hardened critics who don't want this at all are probably to blame due to their black and white arguments.