  We introduce quantum walks with a time-dependent coin, and show how they
include, as a particular case, the generalized quantum walk recently studied by
Wojcik et al. {[}Phys. Rev. Lett. \textbf{93}, 180601(2004){]} which exhibits
interesting dynamical localization and quasiperiodic dynamics. Our proposal
allows for a much easier implementation of this particular rich dynamics than
the original one. Moreover, it allows for an additional control on the walk,
which can be used to compensate for phases appearing due to external
interactions. To illustrate its feasibility, we discuss an example using an
optical cavity. We also derive an approximated solution in the continuous limit
(long--wavelength approximation) which provides physical insight about the
process.
