Render condition based on a snippet that checks if focus is on a specific field

Questions
3

Can you go with a custom field renderer? 

I noticed that the html for each field’s UI element is available for modification.

e.g . something like this (may have to mess around with the object hierarchy)

var field = arguments[0];<br>$ = skuid.$;<br><br><br>$(field.element).on('focus',function(){console.log('You have focused on me');});