You can manually add your favourite files in the Quicklist of a Launcher-icon so that it looks like in this screenshot for LibreOffice Writer:

I describe the way for Precise Pangolin using Ubuntu Tweak (Version 0.7.0) - using MyUnity is similar:
Open Ubuntu Tweak > QuickLists Editor > click on LibreOffice-Writer on the left side > click on the little Plus-symbol > Enter the Name of the file (it's the name that will be shown in the Quicklist) > In the Command-field enter: libreoffice --writer /Path/to/file/MyFavouriteText.odt
(e.g. libreoffice --writer ~/Documents/MyFavouriteText.odt
or libreoffice --writer "~/Documents/My Favourite Text.odt"
) > Press Save. Repeat this procedure to add further odt-files to the quicklist.
Note: I had to login again to make the behaviour of starting a favourite file from the Quicklist work properly.
Concerning LibreOffice Calc the command would be:
libreoffice --calc /Path/to/file/MyFavouriteSpreadsheet.ods
Concerning Gedit the command would be:
gedit /Path/to/file/MyFavouriteNote.txt
This solution also works when - for privacy reasons - someone has Zeitgeist totally disabled or just textfiles and/or spreadsheets excluded from activity-logging. Without Zeitgeist enabled, the Dash will show no Recently Used Files.
Best Answer
gedit ~/.local/share/applications/folder-shortcut.desktop
Copy and paste the following content to launch nautilus (the file explorer) with the specified folder
Replace "YOURFOLDER" with the path to your folder
Now navigate to this file graphically from nautilus and drag it to your launcher