Wouldn't it make sense to tie the amount of CPU usage for hashing filelists to the already present CPU choice for uploading files? If I am willing to devote 100% of CPU to uploads, I would also want to devote Max usage to the hash process and get it overwith. People with slower machines usually set CPU time for uploads a lot lower, and as such hashing could take a bit longer.

Personally, when I run the program, I want the hash list done as quickly as possible so I can start editing and annotating the recent downloads.

My 2cents worth