Yes! You can either drag and drop files onto the waveform in each Space node’s control panel, or open the impulse response browser and add your own folders there.
For impulses dragged onto the interface, BEAM will create a copy of the impulse to ensure the preset will not break if the original file moves. If you add a whole folder to the impulse response browser, BEAM will only create references to those files, so it will not copy the original impulses.