Confused by the partial controller support

[StopDropCTRL]

Well on one hand it supports playing with a controller and even has one little bit of a controller gui for selecting inventory or one of four other things to look over yet it constantly keeps showing the cursor in dialogs and always starts it dead center rather than showing it near the options along with the fact you have to use the mouse for certain things like inventory related actions.
Kinda puzzled as to why someone would half implement controller support then decide to not finish it but leave it in.