Feature Request: Add startup G-code to IS Calibration Tool

[TheAndr0id]

The Input Shaping Calibration Pattern seems to work well once you know what to look for. There are three issues I've found:

1. Not knowing what/how to interpret the results. I believe there's work ongoing on this.
2. Recommended ranges for the test. This could/should maybe be addressed in the item above. My Ender 3v2 printed ringing towers best at frequencies X:59.75, Y: 32.1. The Y frequency was indicated easily on this test, the X was not since it was close to the default max frequency. Maybe I could have avoided printing 10+ ringing towers...
3. Startup G-code included is very basic and (in my case) doesn't work well.
   Could we get a text box to include our own G-code? Right now I'm editing the files by hand, and if it was only one file one time it would be fine, but it isn't. Every time I change a value I have to go and remove the generated startup G-code and add my working G-code.

Many slicers and thus their startup G-code run in relative extrusion mode, this generated calibration code runs in absolute extrusion. Could we get a M82 at the start of the generated code (aka, after any startup G-code) to make sure the extruder is using the right set of numbers? This is not a bug/issue, more of a belt-n-suspenders solution.

[thinkyhead]

Good suggestions, thanks! Better tools for IS tuning are on the horizon, but a lot of us are still going to tuning by hand.

Perhaps it would help if we link to videos demonstrating the use of the test model it will be more clear.

I'm working on a redesign of the site and in the process I want to include more images and charts and diagrams to clarify things, so could definitely use the assistance of good graphic designers to make it all clear and not ugly.