1. Yes, just hit the Esc key while in yours or someone's server and click the Save Bricks button
2. Yes, place some bricks like 1x1 bricks for example, then take out your wrench with the Q key and scrolling to it with the mouse wheel, use the wrench on the bricks and uncheck 'Rendering', and 'Collision', this will give the effect of floating objects
3. There's an Add-On called JVS Content and JVS Doors or something, they are place-able and once they're placed, you can click while looking at them to open them
4. Technically you can, there's an Add-On that allows you to create bots, you can probably use the event system to some extent to make them talk and whatever
5. Yes, Blockland runs on the Torque Game Engine which uses the C+ (or is it C++?) scripting language
6. Yes, but only if you're in a minigame and if that minigame allows players to be killed
7. See #2
8. There is a limit, but it's so high that it's pretty much like having no limit
9. Players are free to start a multiplayer server for free and whenever they please, you can even start a dedicated server so you don't have to monitor 24/7 and you can join your dedicated server whenever you want, you just need to learn how to forward the correct ports to your router so it can appear on the server listings
10. You can't make a vehicle in game, the same goes for weapons, items, etc, this requires you to use modeling programs such as Blender or Milkshape 3D, and then you'll need to make a script file so the game will know how it works, to open a script (.cs) file, all you need is Notepad and to know how to script, you can look at the .cs files inside the archive (.zip) files in the Blockland/Add-Ons directory to see how things work