I have made a FCPX Title template called "RJ Auto Lower Third".
The controls for the Auto Lower Third title:
The Background bar of this Lower Third automatically adjusts its length and height, depending on the length of the line of text, the font size, the font itself and the number of lines.
There is a checkbox to turn the feathered edge on or of.
You have the choice between five different types of Build In / Build Out animations but you can also choose to disable the Build In and/or Build Out animation.
The title is free to use and if there is anything you want to add or change, you can choose to Open a Copy in Motion to make changes.
The zip file with the FCPX Tile Template contains a folder with a distributable. To install you have to use the free Motion Template Tool developed by Andreas Kiel. You can find it here:
Be sure to read the manual which can be found on the same web page.