Don't throw away the convenience Dokku brings to the table :-)
Y'a t'il une raison pour laquelle puka n'a pas de site en anglais?
The marketing website of puka is only in french right now (this will be our primary market), but the application itself is fully translated in english. You'll find a link in the top right corner "Accéder à l'application".
> You may also wish to use a specific version of a buildpack, which is also simple
# using v87 of the nodejs buildpack
# replace APP with the name of your application
dokku config:set APP BUILDPACK_URL=https://github.com/heroku/heroku-buildpack-nodejs#v87
Sure there is that, but nothing fundamental about Dokku is different-- its just newer.
So obviously, my recommendation is to switch to Cloud Foundry. Each release has a single, fixed set of components which are predictable. You can also upgrade buildpacks independently of the overall CF installation.
Dokku is currently meant to manage the application deployment lifecycle, not everything related to server management.