[UnLogikal]

I think a lot of people are hung up on the fact that "flagging" isn't "Today."

If you renamed flagged to "today" and changed the corresponding Perspective you'd have no issues. People are just used to certain naming and can't get past the naming. It works the same way regardless.

I feel like Things has sort of ruined some of the spontaneity that you get with real GTD. People feel like they need to plan their day out thanks to Things. When real GTD is based on available time and next actions. Thank them for corrupting a good thing.

I'd suggest anyone really wishing there was a Today view in OmniFocus would go take a look at the GTD book again and tell me where it states there needs to be a Today view. Is it a nice feature? Sure, but don't get hung up on names. Flag items, check your flagged view. Call it good.