First comment: I don't now of any way of selectively allowing italics or bold for words and sentences within IG Pro without using Rich-text.
Rich text requires a lot more "manipulation" by the user.
If you have tried using GA048 to design and print labels then you will see that it takes a little time and patience to prepare each label.
I know it looks simple, but in programming terms its insanely different in providing the feature to allow text input, and even more so when it comes to printing.
No plans to move that feature outside of the labels program at present Trevor.