That's great! I used to use a plastic water bottle as cruise control in my '88 toyota pickup 4WD with the 22RE and 5 speed. It would max out about 75 on level ground with 31" tires. Just kick it out of the way to 'cancel' cruise control. I used an empty one so I could smash it if I had any interference issues.@sbman nailed it. If you cut the wire named engine temp cut relay, and wire a DPST switch such that it will either tie the ECU input to +12V Ign, or complete the circuit normally, it will idle up however much it normally does w/ AC. But, that doesn't seem to be much, like 750 vs 650 maybe?
You can also cut a stick a bit longer than your current seat to pedal distance. For idle up, place stick and move seat forward just right. I've done this with mine for faster warmup and during break in.
This did NOT work with my 09 GMC though. Drive by wire sees it as "acceleration" and not just throttle position. You either have idle or climbing throttle. The throttle climbs to way beyond what I was wanting (about 2K rpm), so I gave up.
Anyhow, if you use the stick and the seat method, and you plan to use it as a cruise control, cut the stick plenty long so you can pin the throttle to the mat without making your knees hit the dash.