I have just noticed two bugs in Igor Engraver:
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In the dialog window Instrument settings for glockenspiel, the field Untransposed doesn't show the untransposed note because it is to high for the field.
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The fields Score transposition and Part transposition can't set a note higher than E6 so you can't get the glockenspiel -- preserving its correct range markings in Igor Engraver -- to become an untransposed instrument in case you want to use the now standard crotales clef for the glockenspiel.
However, I strongly doubt that Noteheads will fix these bugs. Everyone acquainted with Noteheads knows why this is so.