Mistwell said:
I'm sorry, but the fact that something is an opposed check does not mean that it involves distraction or threats. A disguise check is often opposed, but it's also a pretty clear example of being able to take 10.
Actually the fact that something is an opposed check does not ALWAYS mean that it involves distraction or threats. But in the case of hide/move silently it does.
Your example of Disguise is correct because the PC works on a disguise IN ADVANCE, and later on someone gets a chance to see through the disguise. The PC can work on the disguise while he's safe at home alone, without threat or distraction.
But someone trying to spot a PC as they are hiding, or hear them as they try to move silently is OBVIOUSLY a threat and a distraction.
There's no way for the PC to hide or move silently while he's safe at home alone, without threat or distraction, and then use that later on to sneak past a monster. He has to make the checks AT THE MOMENT that the monster has a chance to see or hear him.
Spot opposed by Hide. Listen opposed by Move Silently. One mistake and the PC is caught. That's threat and distraction right there.
No PC is going to be able to remain calm and do his "average" job of hiding and moving silently when he knows that if he fails, the monster he's hiding from will instantly attack him.
And if the monster trying to spot the PC isn't a threat, then no checks would be needed. The PC can just walk right past it in broad daylight, wave hello, smile and keep going.
Ultimately, it's up to the DM to decide what will and won't work with Take 10 in his own campaign. But in my opinion it's pretty obvious that whenever someone hides or moves silently, it's because the person they're hiding from is a threat. Therefore, no Take 10 allowed.