You can toggle the font as you need to. For example, if you wanted to use both built in fonts plus your own:
Output(1,Get("UFont ;Sets your font
Text(0,25,"Grammer 2
Output(1 ;Sets the built in variable size font
Text(8,30,"The App
Output(0 ;Sets the default font
Text(16,7,"By Zeda E.
DispGraph
I could add an argument to allow you to choose the font used to display text, though... Maybe the r token? So for example, instead of actually changing the font used by the program, it chooses just the font used by the routine.