Update 10 January. The current codebase is stable, however it is changing values when you simply load and save a game world. I do not recommend using it currently, as it may have unforeseen consequences within the game.
I am waiting on feedback from Keen to look at the issue as it is caused by their code.
Personally I feel, if we can fix this issue, it should be possible to release SEToolbox again.

As of 6th January 2016, SEToolbox is no longer maintained.
The Space Engineers game base has become too complex for me to continue working with to keep SEToolbox working.
I will look in at the SEToolbox code from time to time, to see if it's viable to get working again, but otherwise this is it. It's game over.
I will continue working on the Admin helper mod script, as long as in game script API works and continue to expand functionality there to cope with the loss of SEToolbox.

Thank for your understanding, it has been fun while it lasted.