Track the status if the form is opened

[Chenna]

Hi,

I have a site where a user (say manager) logs in to the site and can see
all the users( say representatives) reporting to him. Now the manage can
select any user and click on the button "Create Feedback form". After
clicking the button the infopath client will be opened. Now the manager can
save the xml for offline use.

Now the question is, assume that the mangager has selected user X and
clicked on the button "Create Feedback form", download the xsn and saves to
his local machine. If manager logs in the site then we should prevent him
clicking the button "Create Feedback" for the particular user agian.

I am thinking of a solution like, as soon as the manage clicks on the
button, to create a new item in the form library(where i usually store my
submitted forms) with some metadata and set the status as pending. So that I
can disable the button on managers subsequent login until he completes the
form. If this solution is good then let me know how it can be achieved.If not
give me a better approach with solution.