I have always used:

  (setq tuareg-in-indent 0)

as described in the custom-tuareg.el file included with tuareg. This does what you want, but then will do it for all lines after 'in', which maybe you don't want.

On Thu, Apr 14, 2011 at 6:46 AM, Joel Reymont <joelr1@gmail.com> wrote:
Is there an update to Tuareg mode for first-class modules?

I would like this

 let open Name in
     let open Registering in

to be this, for example

 let open Name in
 let open Registering in

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