Press 'ALT-R' to randomly change the computer leader personalities.
When building things with settlers. Give the settler a command like 'r' for building a road then select the settler again with the mouse. Now repeat, until the road is complete. This works with all settler commands like 'p' to clean pollution, 'm' to build a mine, etc... and allows you to build these items in a single turn.
Also on early ECS versions pressing 'SHIFT' and '1234567890T' gives a complete world map.