Setting Delays

I have a minor suggestion to improve setting delays in the game. Sometimes I have two sets on units on different parts of the map and I want them to attack a certain enemy unit simultaneously. I send them both towards the enemy, but sometimes one set of units will arrive much sooner than the other set of units, so I set the former on a delay. I find the slider for setting delays to a bit of a haggle though. I want both sets of units to arrive at exactly the same time, but getting that time can be a bit challenging. I would find it much easier to be able to manually input the arrival time/delay so my unit movement can be more coordinated.