Relationship search in advanced search usability issues

I have backported the ability to search by relationship end date for a customer from 4.3 to 4.2 but I hit some usability issues with the feature in 4.3

1) it is only possible to search on other criteria if searching by relationship_type
2) The start date end date search doesn't allow you to search by one or the other

Also this red flag - the Query object in 4.3 is using MYSQL date comparison rather than php date comparison. We have Australian sites hosted in the US and would expect the server / MySQL time to be a day earlier than the PHP time.

I have patched #1 & #2 for in my 4.2 backport & avoided backporting the change in date & will attach a link to that patch

I've probably exceeded the time the customer wants to pay for on this already so whether I try to figure out a patch for 4.3 or later will depend on their interest in paying (in which case I will pick up the ticket)