I don't like cheating tho
Instability is there for a reason. Disabling instability? No thank you.
In fact, in the newest versions, you can disable the writing desk, and still play meaningfully. There's a good reason for that -- I requested it, because even the writing desk makes abusing the mod too easy for me.
The writing desk's primary function is to make lots of copies of pages. So if you find a rare, valuable page, you can make tons of cheap copies of a world description, go in and grab a few valuable items, and get out. In general, very very easily.
Once you can't make lots of copies, you have to think before you make a mineral rich world -- and probably don't want to.
Making interesting worlds with strange terrain? Sure.
Making rich worlds to rob? Cheap. Too cheap.
If instability is a problem, you aren't doing a good enough job of abusing things. Hint: 3 charged, spontaneous explosions (just one, it won't do enough to hurt you -- but you must have linking books on hand, your at-spawn return book will not survive unless you are outside of the initial chunks), perhaps cave world with meteors (they are up there, you are down below), mushroom island, scorched surface (especially with cave world -- make it three times), etc -- you can safely remove the instability from one dense ores without any trouble when you have all the symbols.
Not to mention diamond tendrils (more unstable than dense ores), or iron tendrils (more valuable, as far as I'm concerned, and much cheaper), etc.
Looking forward to a future version where instability is revised ...
http://binarymage.com/forum/viewtopic.php?f=21&t=2292