I've just finished up a commandline windows app that you can use with a batch file and task scheduler to do this - basically just give it the URL for the S5 and the speed you want it to be set to, and it will apply the change.  I'm thinking about making it so you can easily script switching around what pools you use, etc - if there is any interest.  PM me if you'd like to test it out, it's been working fine for me but it's by no means extensively tested...