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If you want to provide your users some tools for formatting the content of their comments, why not give them a proper WYSIWYG editor? The one that is already built in to WordPress, namely TinyMCE, should be appropriate.
Screenshots
Front end comment used TinyMCE Visual Editor Comment plugin
Cursor position right to left
TinyMCE Visual Editor Comment Setting
Plugin Details
Active Installs
100Total Downloads
14,769Version
1.3Requires WP
3.3Requires PHP
—Tested Up To
4.3.34Added
2014-08-20Last Updated
2016-04-08 3:11am GMTRatings
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