... But why would anyone want the option of having the inputs split? The original reason for it is obsolete right?
In reply to that I couldn't agree more with the answer aso118 already gave above:
... This would be very appealing to me; in a cash wallet, I could set transactions to merge to about 1 block size, where in a savings wallet (on a different computer) I could set the transaction to be larger (20-100 times the block size) to cut down on how long I need to leave the wallet/computer running.
I also think this might come handy in the future: Imagine users setting this parameter and for example an average of last 6 months of this values (derived from PoS blocks) would determine some more global aspect of yacoin network operation. There are other usages and I will write about them some other time.
In any case I believe it is of significant importance to have this dynamic.
How hard would it be to implement something like this? And would there be any downside in security/transaction size/etc?