The whole point of webdirect is that it closely mimics the "auto-update" & under-the-hood notification scheme that happens between regular FMP and FMS. Just like with FMP you do not have full control over when some of that happens.
Well with FM Pro you have the option of choosing if data is auto commited or not on each layout. You do not have that control in WebDirect and my point is that you should as it resolves a number of user experience issues.
You can choose not to auto commit with FM13. You will need to capture clicks with a large background button that doesn't do anything.
But you will still get updates you may not want.
OK that sounds reasonable but how would you implement it on the layout? AS I far as I could get, I couldnt get WebDirect to stop refreshing data when you move from one field to the next.