I discovered a better way to stop yourself from being tempted to cheat! If you do it the following way, you cannot gift yourself items unless you come out of the game completely and modify a cfg file.
1. Go to your Tekkit folder (C:Users[username]AppDataRoaming.technicmodpackstekkitmainconfig
2. Open NEI.cfg with Notepad
3. Search for "lockmode" and change the entry from -1 to 0.
4. Repeat step 3 (there are two lockmode entries you need to change to 0).
5. Save the file.
6. Load up a game in tekkit and you should find that NEI is now locked into recipe mode only. This applies to both creative and survival modes.
I imagine that swimming in any reactor chamber is not a good idea, online or offline.
But I'll nominate you as "Chief Cryotheum Taster", bochen. You earned that honour. :-)
My only Cryotheum taster so far has been an overly curious cat. The cat is dead now. :-(
Good thing I only keep pets inside Minecraft.