These settings can also be found when importing/exporting files in the bottom left.

General Settings

Prefer Textured Solid Mode

There are two encouraged ways to view textured meshes: Texture mode and Solid mode with Textured Solid shading enabled.

If this setting is enabled, the add-on will switch to Textured Solid mode instead of Texture mode.
In Textured Solid mode, objects have additional shading which makes white and untextured models a lot easier to work with.

Import Settings

Texture Mode after Import

Switches to texture display mode when a mesh has been imported (applies to .prm and .w).

Export Settings

Triangulate n-gons

Triangulates faces with more than 4 vertices (also called n-gons).
This will only affect the exported object, the mesh itself will not be triangulated.
Deselecting this might result in broken exports.

Use Number for Textures

Instead of using the texture file to determine the texture number, the number set in the face properties panel will be used for exporting.

Export PRM (.prm/.m)

Apply Scale

Applies the scale of the object when exporting.

Apply Rotation

Applies the rotation of the object when exporting.

Import World (.w)

Parent .w meshes to Empty

Creates an empty object with the imported file's name and parents all meshes contained in the .w file to it. This makes the object outliner a lot less cluttered.

Import Bound Boxes

Imports the bound box for every single mesh of the .w file.

Import Cubes

Imports the cubes for every single mesh of the .w file.

Import Big Cubes

Imports the big cubes surrounding multiple meshes of the .w file.

* Import Layers

This option will be given as soon as one of the above debug settings have been enabled (boundary boxes, spheres and big cubes):
Selector for the layer(s) the debug objects will be placed on. Multiple layers can be selected by Shift-clicking or dragging.
By default, all objects will be imported to the first layer.

When imported, the actual meshes are going to be on the first layer while the debug objects potentially are on other layers.
To view multiple layers at once, hold down Shift and press numbers, e.g. 1 and then 2. While doing that, make sure the mouse cursor hovers over the 3D view.

Export Collision (.ncp)

Export Collision Grid (.w)

This setting is required when exporting a collision file that matches a .w file (e.g. nhood1.ncp for nhood1.w).
NCP files can be exported without the collision grid if the .ncp is intended to be used with an object or instance (.prm).