The rules clearly state,
When taking the First Order Guards must give their order, and that's it. Admins will usually let players get away with talking as long as they're giving an order and being clear. Taking !fo to shit-talk and not give orders is not allowed.
As for increasing/decreasing !fo time, once there are 30 players online !fo extends to 45 seconds instead of 30. Decreasing !fo time, like others mentioned, is just another slight nerf to CTs. When you take the First Order you can lead the round, and extend your one order into the next couple of minutes depending on how you use your time and speak. I suggest anyone that takes First Order understand you're shaping how the round turns out and leading it, so if you need guards in a position to support the order you're about to give, ask them to get situated in a spot that convenient for you and the order.
We will not entertain the idea of allowing Guards to not give warning shots during First Order, as it's not only confusing but also can open up more conflict and problems.
Thanks for the suggestion, i'll leave the thread open in case you or anyone else wants to respond.