Always use the format for ideas. It goes like this...
Proposal:
In a few sentences, state the general concept of your idea.
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Reason:
Explain why you think this is either a necessary or enhancing addition to the game. You should consider the existing game mechanics here and show how this idea improves upon them. Tables comparing costs, times, unit values etc are a helpful addition.
Details:
Explain the specifics of your proposal. How will it work?
Visual Aids:
Put any mock-ups here. Those that are large screenshots should be linked, smaller windows can be displayed using the image tags.
Balance:
Describe what impact this idea will have on other game features. Will it require adjustments or changes? If so, be specific.
Abuse Prevention:
Does your proposal open up possible exploits or make it possible for players to cheat? If so, then how can this be addressed?.
Summary:
Give a final wrap up and list any questions you think may still need to be answered to improve your idea.