Don't make me type units
The fields in the Paragraph dialog box don't compensate when you forget to type the units, even when they're presupposed. It doesn't even fill in the units for you after the alert box pops up.
more ridiculous is that you have to put a space between the number and unit
When you're tabbing through the Paragraph dialog box to enter line spacing settings, it would be great to only have to enter the desired number of points without also having to type 'pt' after the number.
Yes, such a minor detail that I've seen done for me in Adobe products like Photoshop or InDesign, but doesn't in PowerPoint.