Your modernized loader works like inserter but put items on 2 lines and its good
But sometimes i need to check content of loader inside itself nad i found out that modernized loader works in pulse mod but not hold mode
Can you add hold mode pls because your modernized loader uses inserters in its recipe and inserters can read hand contents with 2 modes

I'm very very like this mod and this feature can be last thing to make these modernized loaders very good tool in logistics =)

This is a Factorio function, not a mod function. There is no "hand" for loaders, and there is no pulse function either. The transfers is specific to loaders within the game and similar to the pulse function is inserters as you've pointed out. The items on the belt are exactly that, part of the transport line. If you attach a wire to the belt on the next tile after the loader, read the full belt contents, it will include the items on the loaders belt.

However, this does prompt the idea of asking Wube to add the "read belt contents" interface to be added to the loader.

Already has been: https://forums.factorio.com/134368

Ohhh oops i forgot about this option from vanilla loader you right devs can add something useful