This is a mod that adds two editboxes inside the commandblock UI. Editing this adimts you to change the delay and the number of times that a command is executed. The mod also include 2 gamerules:
commandBlockDelayRedstone if set to true, when you have a repeater behind the command block the redston signal will be trasmitted only after the execution of the command inside the block.
commandBlockDelaySync if set to true it will make sure that a chain executes all the blocks in order even if a commandblock later executed has less delay than the one executed before. To be executed he will wait that the commandblock that is before it executes its command.
