Can you use +0.1 instead of *1.1 in adjusting the playback speed?
Example:
[ add speed -0.1
] add speed 0.1
Preferences->Keys
For those who are looking for the answer,
Go to Preferences → Key Bindings.
Add a New Input Configuration by clicking on the Plus Button on the first panel. If you are used to IINA Default config, you can also duplicate that config as well. I duplicated IINA Default and named it iina user.
Then on the right panel, click the plus button to add a key binding.
I have set three keys. D for increasing speed by x0.1, S for decreasing speed by x0.1, and R for cycling in x1.0 and x1.8.


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Solution
Preferences->Keys