- Builder/Worker unit like c&c general or SCV from Starcraft
- Supply Depot and Drop zone [refinery that can collect supply from multiple unit in same time , allow to dock from every direction of building and have not docking delay] same to c&c general

- supply empty/loaded animation for collector unit.

- secondary resource [like Starcraft 2 use both gas and crystal as resource]

- oil derrick (building that generate resource)
- Upgrade/Unlock Tech tree like supreme commander 2

i didn't expect to have them all but it's good to know how limit of these engine can handle what i plan before start to make it for real. maybe if you want to make all these logic in the future i can help with graphic i have.
however i didn't plan to work on it soon since i'm quite busy and i need to prepare many thing, in the end this project may never get made because i can't do it alone i need to get some team to work on it anyway. but...
thank you that's all i want to ask for now. :p