Um, since most of them were already mentioned; let me see what I can think of.
I'm pretty sure most of these are already well-known.
-You can place default bricks (including 4x modter) inside of larger modter (8x and above)
-Gradient effect w/ transparent painted plate bricks
-If you crouch and hit a /sit keybind at the right timing, you can force yourself into a somewhat "dryhump" animation, unless you jump or cancel the animation.
-You can build see through walls, I'll provide a- No.
-For a tip, for those who build using any type of floating bricks mod along with no clip, Armageddon's Delete Launcher w/ a duplicator combo is the best and most efficient way to get large scale build projects done in no time, in my personal opinion.
-If you lower the brick limit in the duplicator rtb pref settings to "1", you can avoid duplicating an entire build/map and just select one brick instead.
-For those who use Slayer, if you go into the advanced settings, you can set a pre-round countdown; for those who still don't know how to do that.
For those who use console, again, I'm pretty sure these are already well-known.
-exec("add-ons/add-on name here/add-on .cs file here"); This will execute a specific add-on within your add-ons folder without the hassle of restarting your server, it varies.
-transmitdatablocks(); Transmit your datablocks.