@sescandell i have gastrial problems all day today and doctor tells me it can be 2 more days.. so I'm sorry but until I'm cured I won't be able to work on this..

I'll fix this when I'm back. Or you can work on this fix -> my idea is:

* For each key in builder use `builder.params` value, if a value is set

```yaml
params:
    display: [ id, name ]
builders:
    list:
        params:
            display: [ id ]
```

> In this example, list builder's `display` also will be `[ id ]`

* If value is null, try to import a value from "general" params

```yaml
params:
    display: [ in, name ]
builders:
    list:
        params:
            display: ~
```
> In this example, list builder's `display` will be `[ id, name ]`

* If key does not exist in builder, don't use it (even if it is in general params)

```yaml
params:
    display: [ in, name ]
builders:
    list:
        params:
#            display: ~
```
> In this example, list builder's `display` does not exist