in ubuntu, set the number and speed of strokes for space bar and backspace

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The issue

"in Ubuntu, set the number and speed of strokes for space bar and backspace" was the subject of my Gemini search. In trying to fix some other problem, I was enticed into making changes in Settings, Accessibility. As a result, it seriously slowed down the time it takes to clear / erase text by using the Backspace key, or by holding down the Shift key and the Left key. It also, for some reason, decreased the amount of time between repetitive keystrokes, which means that each time I typed a word with two consecutive letters, a third and even a fourth instance of the letter was created.  Words like cooperative, seem, root, etc. 

Worthless Forum Searches

I did a "routine" Google search to try to find an answer, and most of the forum stuff that  Google search found was either speculative, egg-head replies, or years old...or the discussion was closed without any real solution. So I turned to Gemini and asked the question above. I was not even sure what or how to ask, but Gemini got it right and provided a useful and functional, fairly straight-forward solution. Granted, it could be that the answer Gemini provided came from one of the hideous help forums that I so despise, but I did not have to slosh through all the irrelevant and speculative response to find it.

Gemini Answer:

Actually, Gemini gave me several alternative solutions based on varying scenarios, but it was pretty easy for me to hone in to the response that seemed best for my situation. Here it is:

2. xset Command (Command-Line):

• Open Terminal: Press Ctrl+Alt+T.
• Use xset r rate:
• The xset r rate <delay> <rate> command lets you adjust the keyboard repeat rate.
• <delay> is the delay in milliseconds before the key starts repeating.
• <rate> is the number of repeats per second.
• Example: xset r rate 200 30 (200ms delay, 30 repeats/second).

This also applies to all keys.

I opened my terminal then copied and pasted the stuff in bold, green in the Example above. I hit the enter key and voilá, the changes took place. ONLY I DID NOT LIKE THE SPEEDS SUGGESTED, so I want back to the terminal and instead of using 200 40, I used 400 15. The 200ms delay was way too fast for someone my age; as a result, when I typed two of the same letters together, I was instead getting three or four of the same letters, presumably because my fingers don't move faster than 200ms.