My suggestion was that you can't use a pointer type as a type parameter if
the latter is subject to a contract.
In the case you mention, the contract could be expressed as a disjunction
of value and pointer methods:
contract stringer(T) {
T String() string, *T String() string
}
However, if T were used as an ordinary/return parameter type, you would
need two functions - one for T and one for *T - and so may be it is too
restrictive.
On the other hand and more generally, not knowing whether the type
parameter represented a pointer or a value might lead to some awkward
coding. For example, you wouldn't be able to de-reference the type argument
as it might not be a pointer.
It's clearly an area where some more thought is needed as Ian intimated
earlier.
Alan
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