Hi you can specify what are all the fields shown in one2many popup.

In py,

'field_name': fields.one2many( 'model_name', string="one2many"),

In xml,

<field name="field_name">
                            <tree string="Demo">
                                <field name="field_name" />
                            </tree>
                            <form string="Demo" version="7.0">
                                <sheet>
                                    <group>
                                        <field name="field_name" />
                                    </group>
                                </sheet>
                            </form>

</field>



Or you can make the tree view itself editable like,


<field name="One2many_field_name" >
                                    <tree editable="bottom">
                                        <field name="name"/>                                       
                                    </tree>
</field>

As far as I know you can not switch to form view without a pop-up or new window.