  We briefly describe how the Monte Carlo generator WHIZARD 2.2 can be employed
to study large QCD effects enhancing the top-antitop production threshold at a
next-generation lepton collider. While present state-of-the-art predictions at
NNLL order are confined to inclusive total cross sections, our tool can be used
to simulate differential distributions including NLL threshold resummation in
the production, and with off-shell decaying tops. The new model will be shipped
with WHIZARD from version 2.2.3 onwards, to be released along with this
article.
