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… Is there any way to have sharps and flats show when using Notation Style (Tablature) when checking the "Use Letters" option? 

Perhaps make this a sub-option of the "Use Letters" option? …

Steve McDonald,

I am afraid I do not understand.

Sharps and flats belong to the (standard) diatonic music notation (with 7 diatonic scale steps).

Tablature usually is a chromatic music notation (with 12 chromatic scale steps) - for a fretboard instrument with chromatic fretboard (e. g. guitar).

Sharps and flats do not belong to chromatic notation.

Sharps and flats do not make sense in chromatic notation.

The numbers in Tablature notation are fret numbers.

Example:

The number sequence

8 - 10 - 12

means playing on the frets 8, 10 and 12.

If you select the option Use Letters, you will instead get the letter sequence

i - l - n

(i = 8; l = 10; n = 12)

which means playing on the very same frets - you might prefer to call them the frets i, l and n.

Please explain what you mean.

The better we understand, the better we can help.

Are you perhaps talking about some sort of special fretboard instrument, with diatonic fretboard?