This is a discussion area for the enhancement: https://docs.moodle.org/dev/LTI_Services_on_LTI_1x
See also tracker issue: https://tracker.moodle.org/browse/MDL-60416
LTI Services access has been artificially constrained to be offered only
to tools deployed using a Tool Proxy (LTI 2.0). This improvement is to
make those services available to manually configured tools too as
options in the configuration interface.