Hi Nico,
Thanks for your post and we are very happy to hear you liked the query builder. We actually support wider range of comparison functions in the query builder but show those options only based on the datatype associated with the selected attribute. I'm attaching some examples below showing how this looks for numeric and date/time attributes.
The datatype ranges can be defined using RDFS or schema.org vocabularies as explained in the docs. Is it possible you don't have range definitions in your model?
Best,
Evren
