How can i control the Idle speed effectively

[donjr5]

Don't know if you could do it without rewriting some code on the MS, but if you had a way to mount a fast idle solenoid or dashpot-type solenoid, you could do it with the flick of a switch.
I personally use a bicycle shifter mounted to my transmission shifer (right below the knob) as a hand throttle. It also lets me pull up to higher RPM's to climb a really rocky hill without my foot bouncing on the gas pedal.

[LT401Vette]

You could always hook the switch to a fidle directly.