Text tool needs direction/position setting for the outline
Currently, the Text tool renders the outline inwards glyphs. While this has its uses, it's also very easy for things to go really wrong, especially when you use thin typefaces or typefaces with large weight contrast.
GIMP, outline growing inwards:
Inkscape, outline centered:
Ideally, GIMP would be able to give users an option how to position the outline: inside, outside, centered.
Please consider this in your future development.