This is not a duplicate of Add a way for moderators to cast a normal, non binding close/open vote as that asks for the ability for moderators to cast a non-binding vote. This, on the other hand, asks for the ability to simply add things to community review, without casting a vote.
I like my hammer. It's nice to be able to instantly close an off-topic post, especially at times when the site isn't too active.
But the hammer is double-edged: if moderators constantly hammer-close off-topic questions, they never end up in the review queues, and the community gets "trained" to wait for a mod hammer.
If moderators could "mark" a post as (potentially) off-topic without actually hammer-closing it, the question would be taken to the close queue for the community to handle, and then the community gets "trained" to monitor the review queues.
The mechanism for such "marking" already exists: one would expect an off-topic flag to get the question into the the close review queue for the community to handle. But as a moderator, flagging a post as off-topic has the same effect as a close vote: it's a binding action.
I think moderators should have both options: a binding close vote to hammer-close, and a non-binding flag to get a question community-reviewed in the close queue. This would be extremely useful, especially for gray-areas of a site's scope, where a binding close vote isn't an appropriate action.