I’ve made my own extension based on the ReplyPantry by Sevenspark but had no time since then to build in proper options, tough I added a few more features and updated the styles and behaviour a little bit.
You would need to download the source files, install it as unpacked extension, edit the manifest.json a little bit and the assets/js/script.js that it gets applied where you need it and generate a crx file out of it, which you can then properly install on each of your chrome browsers (unpacked extensions doesn’t get synced between devices)
See here: TextPaste
I’m using it with BBPress. It adds a custom button to the WYSIWYG Toolbar which opens an overlay with text snippets to paste into the textarea. All data is saved in localstorage (no sync between devices).
This is definitely a work in progress and I plan to further improve it sometime, until then feel free to fork it and abuse it to your needs.
Hopefully it helps someone.