Hi Rosalind,
This can be a dilemma. To me the contests are an opportunity to sharpen one's skills. Imagine if you were compiling a grid and the word in question was the only one which would fit in, then you would feel obliged to provide the solver with a decent challenge to solve it. So really any old word would do wouldn't it .
On the other hand words with more possibilities would probably make for a more varied and interesting contest.
On the whole I think
Clueless is more suited to the "challenging" words while
Peer Review may be more suited to the "entertaining" ones.
PS For my
Clueless this week I gave two words with loads of defs for each but really only one for the two together. I like to see the the ingenuity of our setters...