Support custom install tasks from profile [#2267895]

We've had more issues with distributions where the installation went south...

New example: https://drupal.org/project/erpal

The install gets so far that a login link is sent ... but still fails, and gets cleaned up because of:

Exception Object
(
    [message:protected] =&gt; Company name: field is required.
Street: field is required.
Postal Code: field is required.
City: field is required.
Default currency field is required.
Default VAT rate field is required.
Phone number: field is required.
Email: field is required.
    [string:Exception:private] =&gt; 
    [code:protected] =&gt; 0
    [file:protected] =&gt; /data/aegir/platforms/erpal-7.x-2.0-beta1/includes/install.core.inc
    [line:protected] =&gt; 414
    [trace:Exception:private] =&gt; Array ....

It could probably be fixed in the profile by providing defaults.
Or could we provide a minimalistic install task that as a last step redirects to the new site to finish some final steps?