We do understand that they are templates and other option to customize the font, however the user is requesting for Custom font during export where they can make few customization in the font and other details on the several part of the document without having to update it outside RFPIO.
Enabling the function of choosing certain custom font as in content header, footnote, bullets while exporting would be beneficial to the user.
As of now it only apply the same font consistently throughout the document.