Using multiple current sense resistors in parallel to handle a high current measurement with cheaper resistors
It's a valid approach. Be careful that the power ratings really apply if you're scrunching the parts together, and if you're attempting a Kelvin connection (especially) keep the layout symmetrical. 

Edit: if the parts are SMT, this app note from Vishay is useful in evaluating the thermal management issues. Data sheets often do not have sufficiently detailed application data. If you spread the resistors out too much you may increase inductance which can create problems in shunt resistors for current measurement of fast-switching circuits such as many motor drive cuircuits.