[Feature]: Custom hard keyboard key repeat speed

[minstrike520]

Feature description

My request is to add custom key repeat speed settings for hard keyboard.

When I'm using nvim on termux with my tablet (with hard keyboard attatched), I found that the cursor movement is kind of slow. After a little bit googling, I learned that how fast is vim's cursor depends on key repeat speed of the terminal. With this in mind, I looked for key repeat speed settings, but I couldn't find any.

If this feature is implemented, those who use hard keyboard (and myself) may benefit from this.

Additional information

Related discussions are here:

1. https://stackoverflow.com/questions/23078078/speed-up-vim-cursor-moving-through-j-k
2. https://www.reddit.com/r/termux/comments/rbbxre/xset_alternative_for_termux/
   n
   If the question of the second one is solved, I think my problem is solved too, but it's not.