Regarding the original topic, nearly a year late but I recently finished a set of scripts that hopefully fulfill the requirements above.
Primarily, Find Lyric, a script that displays a dialog allowing you to find a note with the specified lyric or phonemes, searching forward or backward.
Due to the scripting capabilities of SynthV, there are two main limitations. The dialog is “blocking”, as in you cannot interact with the editor while it is open, and there is no way to have “Prior” and “Next” buttons, so this is accomplished with a “Search Backwards” checkbox which modifies the behavior of the “OK” button.
The default behaviors can be modified by changing the variables declared at the top of the file.
The following scripts should help supplement this core functionality:
Select All With Lyric accepts user input and selects all notes with lyrics that match. There is also a checkbox to match phonemes instead of lyrics.
The rest of the scripts don’t offer additional functionality, but can offer easily hotkeyed shortcuts to find/select a note that matches your current selection instead of needing to interact with a dialog box.