> You mean a function in mne.viz?

yes

> Alternatively we could modify
> plot_evoked_topomap to accept a list of times as the time parameter (and an
> ncol parameter).

yes indeed. I just want to make it super simple to plot in an interactive mode.

> good defaults for vmin and vmax
>
> The plot_evoked_topomap default is to use the data range, is a hardcoded
> default preferable?

yes that's fine.