One thing that I hardly see implemented is grouping of numbers and strings in 4s or 3s. Like the credit card companies do on their credit cards.

For example, if you need to show me on a website my CBU, international account number which is 24 numbers long, please, don't show them like this:

345234234665232423247322

Show it instead like this:

3452 3423 4665 2324 2324 7322

It is much much easier to read.

90~95% of the time were numbers (or even characters!) are listed, nobody splits them.

This I learned in Isaac Asimov's book "Asimov on Numbers" IIRC. Great book by the way.