Select the keyword under the cursor

[vergel]

Example - I clicked the word function and all words function in the text got underlined.

This nice feature is invaluable for editing the source code ;-)
Your competitors have it.

[alex]

Dear D,

HippoEDIT also has it The feature called Smart Highlight Navigation -> Smart Highlight.
The same result you can get by Ctrl+Click on word function.

In compare to competitors, HE does not highlight all matches based on matching text, but also take into account word context (as skip comments, check only inside current scope etc).
And try 1.50 beta, if you do not use it already: http://forum.hippoedit.com/beta-version-test/alpha-1-50/

BR, Alex