It would be very helpful if users could choose whether to populate Forms fields via lookup according to the value of other fields in their form.

For example, it would be nice to be able to express something like, "Populate fields X, Y, and Z with data from columns [x], [y], and [z] in table T if the value of radio R equals 'True'".

Currently, users are limited to, "Populate fields X, Y, and Z with data from columns [x], [y], and [z] in table T if the value of field A matches a value in column [a]", or they can simply populate a field with column values.