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I suspect that the theoretical Maximum Cell number would be 99x99

However in practice that is a sort of an unmanageable shape.

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For those interested in such matters I can confirm that 10x90 cells is possible in FD 2.14.

It is possible to also increase the width to 20x90, and probably beyond, but on my setup that makes the FD page bigger than the screen.

For those with nice wide screens you could maybe play around with larger values

As you set Cell numbers, FD will compute the cells, expect to see this Unresponsive Script Message.
Just hit continue and FD will continue to compute the page.

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Fast Dial with this number of cells at least on my machine becomes quite unusable.
Perhaps with plenty of ram and a fast processor, it would be fine.
Feedback welcome.

On my set up

Remove cell clunkety clunk clunkety clunk unresponisve script message hit continue clunkety clunk clunkety clunk.

Preferences menu seems to lose focus quite often

Not for everyone.:-)