Carlos,
As long as you have an unfiltered tag on each table on DELETED() Rushmore should still work. To confirm this you can use SYS(3054) (I think it's only in VFP 5.0) to check the level of Rushmore optimization in your queries.
>I have set deleted switched to 'ON'.
>I have my indexes without filter.
>I have an index in each table tag 'deleted()'.
>
>Knowing this, have i rushmore correctly activated? or 'set deleted on' is disabling rushmore?.
>Thanks.