While we’re waiting for chord symbol support, let me share my workarounds with you. You can enter chord symbols as text objects, and use superscript to acheive alterations if that’s your style. Accidentals, for now, are another story, but…
If you’re a Mac user, you have the handy Emoji & Symbols viewer available from the menu bar. This gives you a means of entering accidentals without the SMuFL website (see video at https://dl.dropboxusercontent.com/u/45129398/Dorico-ChordCheat.mov):
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Type symbols in place as text objects.
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Position the cursor where an accidental needs to go.
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Select “Music Font” in the dropdown.
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In the menu bar, select “Show Emoji & Symbols.”
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Select “Musical Symbols” from the sidebar.
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Double-click your desired symbol; it’ll enter the Unicode necessary to produce said symbol in your text.
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Repeat until the release of Dorico 1.1.