Suggestion: Add configurable frequency settings for numbers, punctuation, and symbols

[berhili098]

I’d like to suggest a feature that allows users to control the rate/frequency of specific character types (such as numbers, punctuation, and symbols) in custom or default typing tests. For example, it would be great to have a slider or input setting where we can adjust how often numbers or punctuation appear in a given test. This would allow users to tailor their practice sessions to focus more on areas where they need improvement.

Potential benefits:

More personalized practice sessions

Helps users gradually increase difficulty

Useful for people specifically training for coding or data entry contexts

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Here's an example where I sometimes get no numbers at all, and most of the time, it's just one or two numbers in a long sentence — which doesn’t really help with focused number training.

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