This issue can also be resolved by having a "light" GMC client like a web wallet, or electrum like client. Fast transaction speeds is good for a gaming currency.
As we understand it, Transaction speed is not altered. Confirmation time however is. If a recipient requires 10 minutes of mining to consider a transaction as safe, then whether that represents 20 blocks or 10 blocks makes no difference to the security or speed of accepting transactions as "confirmed". It does however reduce the resource consumption of servers, client, bandwidth, memory, and processing, by half.
Real-time Transactions can only be provided by accepting 0-Confirmations, or by utilizing a trusted payment provider.
Light GMC web wallets (trusted payment providers) or Electrum like clients will also be considered as additional steps.