Hi there
The brush size in Select / Mesh Palette should always go down to one face (triangle) independent of size or number? of elements.
You may implement it also a by a checkbox: Select one Face. or adapt the limitation
Until a certain size (or number?) of faces this is already possible. However if facets are smaller the brush selects always more than one:
Advantage:
In case you select a triangle you can separate this (Modify / separate) then switch to Model / Mesh to Brep.
Further constructions can now be done easily by creating a plane through the 3 corner points and create a sketch respectively.
This is helpful to construct holes, pivots etc. in CT scans of bones for instance.