After playing many hours of AoS I have come to realize how great it would be to have an auto reinforce feature on the Dreadnought that doesn't only build destroyed units, but let you tweak your Dreadnought army any time by clicking the "template".  

As you can see in the image I added a small window for "save army" and "auto reinforce". It would work by first selecting the full army composition you want with the current Dread. As usual the units and their count would appear on the right side of the Dread info panel. If this is the army composition you want at the time you could click "save army" and tell the game to keep up with the unit count on this "template". If you lose one of the units the number would decrease like normal, but you could designate it below template level by a red number, or any other type of indication. The "auto reinforce" option would do exactly what it says. When you have an army composition saved and reinforcements selected, the units will be built by factories as they are destroyed. Now as the battle continues you need to adapt to your enemy. The best way to win is by adapting to counter your enemies army composition. The secondary feature in this is the ability to tweak your "saved army" by clicking the unit frames in the normal build panel, or by clicking the units picture in the Dreadnought army panel. Left click would add and right click would remove. Of course this doesn't explain what happens to a particular unit if you remove it from that army composition when right clicking. Destroyed, disbanded, etc.?  

This feature could be a very powerful tool since it would allow you to make on-the-fly changes during long term engagements.