It would great to be able to apply the Hardware Accelerator to specific devices or ip addresses or a range of ip addresses and turn it off for an ip address or range of ip addresses.

Admin and staff (Trusted People) could have hardware acceleration turned on but guests for example cannot.

You could then accurately monitor those people / devices that you want to monitor without compromising trusted peoples access to the internet.

I'm assuming that session and bandwidth rules are not ignored when the hardware accelerator is turned on?

I believe you can do this by setting the Hardware Acceleration to "Manual" mode, then select "Apply the Class Rule in Quality of Service".
With that enabled, there's a tickbox in Quality of Service rules that you could then apply to specific local IP ranges, which should then only accelerate sessions from those IP ranges.