Workflow Usage Question

I am trying workflow module now. And have following questions.

Usage Background:
1)Tow roles defined: Manager, Editor
2)Manager has following operation on the content
a)draft creation
b)content assignment (assign one particular conent type to users(>=1) with role Editor, then the specified editor can edit and submit content to Manager, waiting to be approved and published)
c)publish (publish content to all users access website)

Question:
1)Does this module support 'user account' based assignment?
I mean, if I login as Manager, can I specify which eidtor to assign the work to? I only found role based state transition when defining workflows.

2)Is there any existing module that can list the to-do list for each role in workflow?
Say, if Manager B assigned one content to Editor A, then A will get a to-do list named "To Edit List".
if Editor A finished editing and submit the content, then Manager B will get a to-do list named "To Approval List".