I have a grade 1 MSR, given to me as a gift. It has a square toe. I can say it does not alter my stance and I can see that it could increase the likelihood of cracking. However, although the spine would indicate a mid middle, it does in fact have ping at the toe. the spine does go all the way down though.
On another point. I saw a lovely 2.7 Sabre at Somerset count sports, it has been there a while. If the/a point of applying linseed oil is to seal in the moisture, do bats that have been hanging around in warm shops suffer from a loss of /moisturesoftness?
Why don't bat manufacturers apply linseed oil before they send out bats, the cost must be minimal and it prevents the over enthusiastic new owner trying it out before it is ready. I know a few people who think oiling is an option.
Finally, I have never cracked a bat at the toe, who else has been taught to put the bat down on a Yorker and not to try to drive it through mid off.