Once we investigate the Brush Pen Tool in Manga Studio we will immediately understand why Dave Gibbons loves it and why he uses raster layers for the inking work rather than vector layers.
The Brush Pen Tool does not support vector layers. As this tool is more than interesting during the inking part of your drawing the choice for the layer type is made fast I guess.
The Brush Pen Tool in Manga Studio is only available in the EX version, so you won’t find it in the toolbox of your Debut version.
Let’s investigate the Brush Pen Tool: