I'm unsure as to where things stand with the block splitting and I know it's being worked on.  I had a ~4k block stake that did not split.  This happened right after I went to sleep so the first thing I did this morning was split it and lose a bit of age.  Not a big deal but it got me thinking.  Would it be possible to make it so that one could select whether or not a block will split after minting before it mints?