Default [Q] Control Frequencies on Stock ROM & Kernel w/ Root

Is it possible to control kernel frequencies with a stock rom and kernel with root privileges?

My S4 is on MJ7. I want to control the minimum frequency the processor clocks down to. I feel its too low and causes the phone to stutter for a moment before increasing. Will the kernel and rom allow me to do that once I have root privileges?

Also, as I understand, ME7 and MI1 can't flash custom kernels. Is that correct?

Finally, I understand the G2 has loki to get around its bootloader. Can you flash custom kernels on that? I would be getting a Verizon Wireless model.

After two years with a galaxy nexus, I now see how bad the situation has become for modders on AT&T/VZW.

Thanks for your help