World Rugby announced on Wednesday five law trials which will start next month, including a so-called "50/22" kicking adaptation.
The 50/22 change allows a team to gain a throw-in inside the opposition's 22-metre area by kicking the ball to touch with at least one bounce from their own half.
The rule was used in recent Super Rugby tournaments and its primary intention is to "encourage the defensive team to put more players in the backfield, thereby creating more attacking space and reducing defensive line speed", according to the sport's governing body.
The other laws to come into force on a temporary basis from August 1 include a goal-line drop-out if the ball is held up in the in-goal area, if there is a knock-on from an attacking player in the same area or an attacking kick is grounded by the defenders in their own in-goal.
There are also restrictions on attacking players latching onto team-mates from a ruck and clean-outs which target or drop weight onto the lower limbs at the breakdown.
The final trial allows for a one-player latch before contact, but the individual must "observe all of the requirements for a first arriving player, particularly the need to stay on their feet".
World Rugby has also moved to strengthen concussion protocols, with independent specialists set to review cases when Test players return to action after a head injury.
They will launch a panel of Independent Concussion Consultants (ICCs) to provide expert opinion on whether players are ready to return to action after head knocks.
The global governing body will fully fund the process for Test-level competitions, with ICCs asked to rule when players look to return to action 10 days or fewer after a concussion or on players deemed higher risk due to previous head-injury history.