Attendance?

[Tridion]

There is an example of implementing an events forum with XThreads. This is a really nice mod.

I would also like to add an attendance mod to this. Would this be possible to implement with XThreads? It would add something like the following to the first post in each thread:

Attendance:

Yes:
{list of members}

No:
{list of members}

Maybe:
{list of members}

My Status:
{list box with options 'Yes', 'No' or 'Maybe'}  {Submit button}


Would this be possible with XThreads? Or would I need to write this plugin myself? I am prepared to do so but don't want to reinvent the wheel.