this reminds me of the "command block" from minecraft, which turned out to be inifinitely useful
The problems is with the 'lua code embedded pixel' are that:
Overall the code pixel is not a good idea. If you want it, make a mod for it.
It can be only a command, not a lua code... (example of command: !set type all fire)
And it can't be a mod, because if it's a mod, I can't save it/I can save it, but on other computers that doesn't work.