#39 Form entry options

[Anonymous]

Currently, the use input via the Add command (using
$fdd['field']['values'] ) can be restricted to preset
values. How about a slightly less rigid requirement -
for instance, I want to allow users to enter a 10 digit
number in the field, but I clearly do not want to use a
table to predefine all 10 digit numbers.

Would it be possible, either for an administrator
tweaking the current version, or as a built in feature
with future versions, to define types of data that can
be entered in an Add field? So, text only, or numbers
only?