The checkbox "read .vimrc" and the settings for the path are very far from each other, and it is not clear why the path settings are disabled (you have to find the checkbox).

Suggestion is to remove the separate checkbox, and instead have the two combined (a checkbox "Read .vimrc" directly followed by the path setting without extra label in the same line). Also it's possible to set the "placeholderText" of the path chooser's line edit to describe "leave it empty for default path".

Attached screenshot tries to visualize what I mean.