Right, if you right click in the editing area, you get popup with Find Declaration and it's where you can't add or remove items.
If you need your own items, you can add them to the editor tab popup (right click on the tab with file name above the editing area).
Check Tools->Settings->Integration, it lists all commands and once a new added, it can be added to the tab's popup if you check "Show this command in File Bar popup".
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There isn't even alt shortcuts set up for it |
Actually there are Tools->Settings->IDE shortcuts and in particular Find Declaration is there for sure:
NOTE, we're going to move it into the Editor's shortcuts area in the next release.