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This is not supported yet. Your best option, for the moment, is use linear algebra:
sage: M = matrix([vector(w4^i*w2^j) for i in range(2) for j in range(2)])
sage: M
[1 0 0 0]
[0 1 1 0]
[0 1 0 0]
[0 0 1 1]
sage: vector(a) * M^-1
(1, 0, 1, 1)
which, of course, says $a$ equals $1 + w_4(1+w_2)$.
