Account and Lead assign to me

[Shereen]

I have the following questions please
BY default when a user login go and create an account in SFA the account is assigned to him automatically but this is not the case in Leads. why? this is a bug or something meant to be?

What changes should I make in the service method of the creation of a lead if I want it to be assigned automatically to the person who created it?

I need that because I want to make the sales man only sees his leads which should be automatically assigned to him when he creates them.

The services of Create account and create lead are similar but not the same
I found something I dun understand in the creation of the account
        <set field="partyRelationshipCtx.partyRelationshipTypeId" value="ACCOUNT"/>
should the value be ACCOUNT_OWNER instead of ACCOUNT?

in creation of lead it's
                <set field="partyRelationshipCtx.partyRelationshipTypeId" value="LEAD_OWNER"/>
the second seems logic to me but the first behaves as I wish ( the account is automatically assigned)
Can anyone guide me through this and advice me which changes should I make?

[Shereen]

Also I've noticed that in leads the assign to me button appears and is not hidden in the My leads list
why?

[Shereen]

Anyone can help in leads and contact problems?
why when a lead or a contact is created by someone it doesnt show up in his "my" lists. why he still have to press assign to me.
I've checked the records in the database and I found them correct the owner of the lead or contact is recorded correctly.
this is of a great importance to me because i want to disable the assign to me button.
I'm grateful for any help