Are we looking at the same page in MIC? Here's how the second column on page 219 starts:Sort of. It specifies what to do with things that lack fingers... but it doesn't say what constitutes a finger, and doesn't list all creatures as whether or not they have fingers. Which amounts to "Check the picture: Does it look like it would fit?" - which I don't consider a "hard and fast rule", primarily because you'll get dissenting opinions with multiple people attempting to interpret the same critter.
Then we get paragraphs for amorphous, armless, fingerless, headless, legless, and multilegged creatures along with examples.MIC said:As a default rule, treat creatures of any shape as having all the normal body slots available. Creatures never gain extra slots for having extra body parts [...]. For unusual cases here are some guidelines to help a DM particularly dedicated to details:
Since you mentioned fingerless, here's the definition that is provided:
MIC said:Creatures without flexible digits or extremities, such as horses, lack the rings body slot. A creature need not be able to manipulate objects to wear rings - a hell hound can wear a ring on a toe of its forelimbs.
That's pretty comprehensive, imho. The only way they could improve on that would be a table listing every slot available to every monster which I'd definitely consider overkill.