Hi Dave,
I am afraid this is not an option at present. You can simply declare a few more so that the all common sizes are present (e.g. from 8 to 20 with a step of 1) and a few more. Switching to HTML view would require the end user to know how to use it and find the correct place to edit it, however.
Regards,
Marin Bratanov
Telerik
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