Feel free to may pick my home made specsym - (Python) plugin for Gedit (works for me with gedit-2.14.4).
A Gedit user may edit an XML file $HOME/.gedit/plugins/specsym.xml with his desired tables of favorite Unicode symbols. Thus configuring this specsym plugin for personal needs. The above tar.gz file comes with Hebrew vowels, Bidi marks and more.
Here is a screen shot
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