Either an updated version of TinyMCE or Summernote will be included in a future Mods for HESK release.
My modded Mods for HESK are in use right now at https://support.netsyms.com if anyone wants to see the difference.
This is actually really easy to do, so I did. Just unpack MFH from this repository over your existing Hesk/MFH install. It'll also add support for Bootswatch themes and an option for using an open-source reCaptcha alternative. https://source.netsyms.com/Netsyms/Mods-for-HESK-Netsyms/src/master
An option to choose a bootswatch theme (instead of modifying the colors of the default bootstrap theme) are planned for 3.4.0.
I made a hack-y version of this if you want to take a look: https://source.netsyms.com/Netsyms/Mods-for-HESK-Netsyms/src/bootswatch
The ticket added page would need tweaking around line 521 of submit_ticket.php. I modified it to use a Bootstrap panel because it looked a lot better: http://i.imgur.com/DGJ6YW2.png