Currently Inventor only allows dimension styles to show architectural style units (0'-0") for feet and not for inches. This has been a thorn in my side for my entire 15 year career and my number one hope for each new inventor release has always been the ability to choose which style units to use for inch dimensions. Appending a suffix is a very poor work around, as shown in the next image below, because it gets placed after the entire dimension value. This also then necessitates setting up different dimension styles for angles, hole notes, bend notes, etc.

This isn't a problem in AutoCAD because the suffix can be applied directly to the primary units instead of the whole dimension (which it can also do in text override):

I would propose (and beg, and plead, and whine) that this same functionality be added to Inventor dimension styles.