Most ligature work with this setting, but
ch ck ct ij IJ sp ss st
Those ligatures are usually not part of the liga feature that only activates
the most common f-ligatures; try dlig (discretionary ligatures), or maybe hlig
(historical ligatures), although it's more probably the former.
Is there a way to manually select the ligatures of a font?
You can use a feature file to define your own OpenType features that would
only activates the ligatures of your choice and associate it with a name, say
plig for "Peter's ligatures" (rlig is already used for "required ligatures" in
scripts like Arabic, better not to overwrite it). See
fonts/fea/context/texhistoric.fea in the ConTeXt distribution for how it's done
for tlig (which is not a standard OpenType feature either). Send it to Hans
when you're over, so that he can use it too because he's been traumatised by
the st and ct ligatures :-)
:))