Fingering Certain Bigrams on QWERTY

Using the same finger multiple times in a row with no intervening characters seems detrimental to typing speed. Here are some nonstandard fingerings.

• BU as index-middle. e.g. (numbered a la piano fingering) public → (RH)53243(LH)1, BUN → (RH)232
• NU as index-middle
• IM as index-middle. I often forget to do this. I think I do it more commonly for IM rather than MI, i.e. impossible vs. might.
• Y as LH index. I think usually at the end of words. e.g. usually
• GR, TR as index-middle. I don't do this one, but I often consider it. e.g. transit is usually fingered by me as 1151431.

There are probably many that I'm forgetting.

see also:

• Sean Wrona on "floating". In particular, he types "L" with the index finger when he can???
• ISRT layout, designed to minimize "same-finger bigrams". Also discusses a "repeat" key, since typing the same character twice is / is like an SFB.