I'm trying to replace some glyphs in a font with some from another font using the Merge Fonts command, but I'm having a problem, which is that it always replaces the Unicode values in the target font with the ones from the source font, even if the glyph in the source font has no Unicode value. Basically I'd like the outcome to be the same as if I manually pasted some glyphs from one font to the other in the font window (in that case the Unicode values in the target font are not overwritten). Is there a way round this? If not would it not be sensible to have an option in the merge dialog to control this?