I would like to be able to set the errorPlacement function per form, for example, rather than having that value set it in a single location in the database and define all the custom functionality within. Likewise for onkeyup, onsubmit, onblur, etc. Obviously it's far too complex to do with a user interface, but on a code level it would be a very nice extension.

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Patch adding a drupal_alter that accomplishes this. Not certain if this is the best way of doing this.

The D7 version has this build in, a backport would be nice. Can you do a backport?