You can of course transmit torque during the 'time' the bullets are ramping up and down.
However if you transmit high figures of torque without control over clutch slip or engine torque output you will either slip the contact points of the bullets, jam the system or achieve excess wear on the bullets which will prevent the system from meeting reliability demands.
I had the only dyno rig capable of testing such shift systems in North London in the early 1970s,I also did consultancy work for both Borg Warners Letchworth and British Leyland (mostly competition gearboxes for John Davenport) so as I said no modern methods.
Almost all motor manufacturing companies do not fully bench test layshaft gearboxes in detail today, because the technology is so ancient, practicaly everything possible has been done and done to death.