You can still maximize your transaction chance to get confirmation but with increments like 1.1 sat/vbyte or 2.1 sat/vbyte which can make bigger difference than 1 sat/vbyte or 2 sat/vbyte as chance will be bigger and you can still save more satoshi.
It's not really free to customize the increments of the fee because in Static option, you don't have an option to increase the decimal point, you can only choose from 1 sat/vbyte to 300 sat/vbyte. The only way to customize the decimal point is you're using ETA or Mempool option.