BayTurtle's Reinforcements Mod

This mod simply adds a panel that allows you to spawn any unit, on either team, after the battle was already started.

The Panel

To open the panel during battle, simply press O. To close it, press O again. (You can change the keybind in the CONFIG file, O is just the default)

While the panel is opened, your camera will be locked to it's current rotation.

The first few buttons may appear blank, so just scroll down until you see all the units. You can also search for units.

The panel can be dragged to any position.

When you press a unit button, it will turn green to indicate it is selected. Click anywhere on your screen to spawn the selected unit. Once you're done spawning them, click the button again to unselect it.