We evaluate odoo Studio (v11)  and we installed the calendar app. The contacts app, calendar and a module made with Studio would fit our needs but when I start Studio at the calendar view and I chose a custom selection field x_studio_field_<some_random_chars> as color selector the color do just what they want. No chance to customize. Thought when I start the developer mode and click on the "more" Button I had the chance to do it like [["red","Value1], ["blue","Value2"]]. I'm no developer. Know how to code a little and most of the times I get a solution when I have some examples but odoo Studio is lack of documentation. Especially these parts, the Automated Actions and Filters.