The new scoring system will make life easier for the scorer and easier for everyone to check the scores.
I don't expect to see any significant changes in any of the scores due to this change, but I do expect it to be easier to work with and easier to check.
If you are getting an HW45 the barn door will come in handy -
but is unlikely to suffer too much damage
Joining the GAMO Gang is the best thing you could have done to improve your MPL scores, and making the cards easier to score won't make any difference to you or the Centres abilty to maximise the MPL rules.