This script provides methods to manipulate keyframes and property channels precisely in compact UI
KeySmith Keyframe and Property Editor for After Effects will allow you to type in any value type in fact, accepting input in relative or even absolute values, or percentages. KeySmith works in pixels by default, but Smart input fields accept values such as 1in, 1ft, 1cm, 1mm, 1% and will convert it all accordingly. You are also able to handily edit the values of separated channels as one keyframe, as well as changing the speed and influence of the keyframes all from one editor.
It is interesting to note that KeySmith works with values, which means that you are able to change the values for anything in After Effects with KeySmith, such as the color values for a Solid right from the editor. Check out the The KeySmith Keyframe and Property Editor for After Effects over at AEScripts here.