Workflow rules integration with node form buttons

I'm currently working with workflow.module and writing a custom module to replace the "Save" button with buttons like "Publish" and "Draft".

What i did: Hidden the "Save" button (#access=FALSE), added the publish/draft/... button with own submit handler, changing the form state values. After changing it, calling the original node_form_submit handler..
See one current implementation at:
http://drupalbin.com/12086

It saves... it stores the right values in workflow... But any rule related to workflow.module now does wild things.
Conditions don't seem to get checked correctly while a regular save button hit with activated workflow form is triggering rules and passing condition checks perfectly.

Workflow rules integration is at:
http://drupal.org/node/370111
http://drupal.org/files/issues/workflow_rules.zip

Do you have any idea why condition checks could result in completely wrong results?
Thanks for your help.