Q1: Because you made the Team the owner of the record, it is easiest to work out - the user will have read/write/append|to privilege. They might have more privileges than that if the user has a role themself with Organisation level rights (eg to assign or
share).
Q2: As above: create/read/write/append|to on the custom entity, but only the rights they already have on the Account. Rights on a child entity have zero impact on the parent entity.
Q3: Sharing is irrelevant if the Team is already the owner, the user cannot get any more rights this way. Only difference would be that if you reassigned the Account to a different owner but forgot to change the Share the Team and its members would still
have access. For your scenario there seems to be no need to share and in the long term adding more shares will impact performance as the POA table grows.
Q4: It depends. You need to check the relationship between Account and your custom entity and see if the cascading behaviour for "Share" is set to Cascade. If it is, then the Share on the Account will also be replicated on the custom record. But I would
not use sharing if you can avoid it. Notice however that you could get the Assign itself to Cascade if appropriate, so assigning the Account to the Team would also re-assign the custom record (if that fits your business rules).
Additional approach:
You don't have to make the Team the owner at all, just make sure they have read/write/whatever privileges at BU level. Then any User in that Team, even from another BU, will be able to do those things (read/etc) to all Accounts in the BU the Team is in
(when I say "in" a BU, I am using shorthand for "owned by another user or Team in that BU"). Likewise the custom records. This is less selective than choosing which records to assign to the Team, but might fit your underlying requirement.
Read more about how user / team / BU / security roles really work here:
Security Roles and Teams in CRM 2011 – An Inconvenient Half-Truth
Read more about Cascading behaviours (and particularly re-parent rules):
Implicit Shares in Microsoft CRM 2011
Hope this helps.
Adam Vero, Microsoft Certified Trainer | Microsoft Community Contributor 2011
Blog: Getting IT Right
