When creating a store that can use a local file, most store types provide a text box with an example file:// URL and a browse link to bring up a file picker. A few provide the example but no browse link, and others provide just a text box with no indication of format (just a path vs a file url)
This should be consistent across stores. This may involve updating GeoTools store metadata, or changing how that metadata is interpreted to produce the UI.
Text Field, no indication of format, no browse
Text Field, example URL, no browse
Text Field, example URL, browse link
Directory of spatial files (shapefiles)