Strategies for LESS/CSS in addons?

[dieter (Dieter Maurer)]

@jensens

...
After install I need to got to the resource registries and hit the build button, only then all works fine.

There are two things I cant get to work:

1. compile the less file while installing (or if not possible: while buildung the addon)
2. add the resource to an existing bundle - so I do not want to add one bundle per addon, this does increases the number of requests needed to load the site with every addon.
   ...

I have not yet had a close look at Plone 5. However, I am quite confident that Plone 5 has retained "GenericSetup" as important configuration tool. In this case, you could use a specialized "GenericSetup" import step for your add-on to do all the necessary things which cannot be done in other ways.