For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Or create a GitHub pull request.c) if you want to post a diff of your changes here, I'll consider folding it in to the main code.
Because I support the DB created on Fabrik with more than 500 different lists and ~30000 elements. So, it is better to me just toggle some options in the element settings. It saves my time and let me focus on other things.b) why not just add a PHP validation in 'replace' mode that does this to fields that need it? Achieves exactly the same thing, doesn't require modifying core code.
Ok, I'll post it and one for textarea element with readonly option.c) if you want to post a diff of your changes here, I'll consider folding it in to the main code.