anyone have an experiance with a inline stop as far as how low of a cruise RPM you maybe able to cruise at

I use a Biondo inline stop. You can set it anywhere from WOT to completely closed. Whether your car is happy at that RPM and repeats is a different story but the stop works great!

I usually set mine at 4K and shifted at .5

I bring mine down to dead idle. Was never able to get it to repeat a given RPM. But that's also with Terminator injection, and I have difficulty with idle RPM creeping with temperature on that anyway.