ISettingsInspectorExtension.OnInspectorGUI

Description

Allows you to add custom GUI controls to the version control settings in the inspector.

using UnityEditor;
using UnityEditor.VersionControl;

[VersionControl("Custom")]
public class CustomVersionControlObject : VersionControlObject, ISettingsInspectorExtension
{
    public void OnInspectorGUI()
    {
        var oldUsername = EditorUserSettings.GetConfigValue("vcCustomUsername");
        var newUsername = EditorGUILayout.TextField("Username:", oldUsername);
        if (newUsername != oldUsername)
            EditorUserSettings.SetConfigValue("vcCustomUsername", newUsername);
    }
}

Additional resources: ISettingsInspectorExtension, VersionControlObject.