When you have a font size change, it's just a number. That's all it is. The number gets passed along to tell the system what size to make the font. It should be trivial to allow a larger selection of numbers to be passed along to the system to get a different font size.
What would be perfect is to have buttons labeled + and - that also shows the number. And also a button to go to the default number. And if you hit the number, allow you to type in the number you want. Then all that happens is this number gets passed along to the system to get the font size and done. The only difference between this and what Kindles/Sony Readers/nooks have now is it's a different interface.
Currently, the best Readers are Kobo Readers for font size changes. But it could still be better as mentioned above.
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