usr338
To make things clearer, we gotten used to refering to "people building apps" as "authors", to separate them from the "people using the apps" (eg. end users). So in your case, you are talking about application authors having more options to customize UI components.
Adding more options for authors is something we do regularly with official releases. We are adding styling options for font-styling, layout adjustments, etc. It takes a lot of work to make all possible combinations of all options work in all cases.
We will be adding more options in the next release (R3.8) as well, but we currently do not plan to extend these too much in the mid term.