I think the only place where game fonts are drawn into the Editor is for GUI's, and because .NET font rendering doesn't have equivalent methods for setting a vertical offset, line spacing, or outline, all of those properties are not considered. To fix it, someone needs to implement an engine-equivalent font renderer, but since the font spacing is slightly different between engine ports, if it exactly matches on one platform it may not match on another. It is probably best in the short term to just add a note to the manual and the interface, that these properties are only implemented by the actual engine.