Some problems with the brick mine: (events)
1. Most good minigames are going to start you off with a standard set of weapons, or nothing, and you will be able to choose from a rack of weapons. So therefore you won't have a wrench.
2. You will need build trust of the admin/builder of the DM, and that can at times be hard to get, the admin doesn't want to give everyone build trust.
3. Even if you do copy the event script, and quickly make a brick, doing this out in the open will make you turn your head down for 1-2 seconds, and you won't have any idea whats going on, and during this time someone could easily kill you. So a brick mine would only be useful if you are in an enclosed space, like a building and you know you have enough time to place a mine.