How about this? You select an object and then hit say CTRL+SHIFT This brings up a counter on the selected object. Now select a second object and move it towards the 1st. The numbers (BUs) on the counter reduce until you are as close as you need your 2nd object to be. This might help when moving complicated groups/families or just single items under difficult conditions.

Available on Amazon for the Kindle E-Reader

All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...