  Measurements of the coherence factors (R_Kpipi0 and R_K3pi) and the average
strong-phase differences (delta^Kpipi0_D and delta^K3pi_D) for the decays D0->
K-pi+pi0 and D0->K-pi+pi+pi- are presented. These parameters are important
inputs to the determination of the unitarity triangle angle gamma in B+/- ->
DK+/- decays, where D designates a D0 or D0bar meson decaying to a common final
state. The measurements are made using quantum correlated DDbar decays
collected by the CLEO-c experiment at the psi(3770) resonance, and augment a
previously published analysis by the inclusion of new events in which the
signal decay is tagged by the mode D-> K0Spi+pi-. The measurements also benefit
from improved knowledge of external inputs, namely the D0D0bar mixing
parameters, r_D^Kpi and several D-meson branching fractions. The measured
values are R_Kpipi0 = 0.82 +- 0.07, delta_D^Kpipi0 = (164+20-14) deg., R_K3pi =
0.32+0.20-0.28 and delta^K3pi_D = (225+21_-78) deg. Consideration is given to
how these measurements can be improved further by using the larger
quantum-correlated data set collected by BESIII.
