you can use liteloader and isntall voxelcam, it's allows you to take screenshots and also upload them to imgur all from in-game
Updated to 1.7.10, also changed the website button to give a confirmation screen, just like links in chat.
A version with bugs is available. And it doesn't work with the recommended build of forge (it works on build 1361)
Isn't it like having the fly mod without the fly feature? Or it is only toggleable when you have the potion effect?
Technically night vision is a vanilla minecraft feature that everyone has access to. You can change your gamma to whatever you'd like to have it at. Feel free to google it for more info.