When I use Interlock to control intersections some entrances have higher priority than others. It is bad because trains moving in one direction wait less, and in other directions wait more.

Please allow Signal Interlock Boxes to have the same priority so when one become red, next in group was allowed to be green. I think you can use X coordinate as priority so Interlock can be used N-S or E-W for different setups.
Of course some setups can be broken with this change, but only priority based and it can be repaired with some relocation.

May be a good use of Signal Sequencer Box can fix it, but I did nit find it.

And why Signal Interlock Box cannot connect to adjacent Signal Relay Box like Signal Receiver can? It can simplify scheme.