honestly, they could have fixed it by making the sliders more accurate/larger, too- not like we need precision better than tenths of a percent unless we're completely OCD about things. but yeah, this is just a small bit of poor GUI design- hell, if it was me, I'd have used Slash values (IE "180.6/90") if for some reason multiple input fields wasn't in the cards.
Its frustrated me a bit before, but recently I was making a design that required a very small negative number for green, but I can't get it due to the design. So my awesome ship design is unfinished. : (