  We show that it is consistent relative to a weakly compact cardinal that
strong homology is additive and compactly supported within the class of locally
compact separable metric spaces. This complements work of Marde\v{s}i\'{c} and
Prasolov showing that the Continuum Hypothesis implies that a countable sum of
Hawaiian earrings witnesses the failure of strong homology to possess either of
these properties. Our results build directly on work of Lambie-Hanson and the
second author which establishes the consistency, relative to a weakly compact
cardinal, of $\mathrm{lim}^s \mathbf{A} = 0$ for all $s \geq 1$ for a certain
pro-abelian group $\mathbf{A}$; we show that that work's arguments carry
implications for the vanishing and additivity of the $\mathrm{lim}^s$ functors
over a substantially more general class of pro-abelian groups indexed by
$\mathbb{N}^{\mathbb{N}}$.
