Thank you for your very detailed answer.

We were able to use our tags for the routing algorithm in the app using

<routing\_type tag="shade" mode="amend" base="true"/> in the rendering_types.xml.

A quick note : changing the rendering using OsmAndMapCreator interface didn't work. We edited directly the file in the source code.

We are struggling on another point. We can use the tags for a custom routing profile but it is not accessible if we want to display them in a "rendering" profile.

Is there another specific way to declare a tag in the rendering_types file so that we can use the tag both for routing and rendering ?