Is there a way to use x86 and x86_mscoff with dub simultaneously.

[ciechowoj via Digitalmars-d]

Currently dub reports following message when the -m32mscoff flag 
is specified in dub.json.

```
-m32mscoff: Use --arch=x86/--arch=x86_64/--arch=x86_mscoff to 
specify the target architecture, e.g. 'dub build --arch=x86_64'
```

The problem is after the change the user is unable to build the 
project just with `dub build` (they need to specify the arch 
explicitly).

Is there a way to avoid the requirement for specifying the 
architecture explicitly or at least provide a meaningful message 
to the user that they should use `--arch=x86_mscoff` ?

Or a way to force dub to use VS linker instead of OPTLINK for x86 
case?
Or a way to override the default architecture?