I made this little setup using scriptaculous - mainly to try the code out. I know everybody uses jQuery, but this one won't conflict with core mybb.
What does it do? Well, it will hide the post buttons, and on a click will show them - then rehide them.
Here is the code for horizontal post bit:
and here is the code for classic postbit:
You need to add this link to the Google API in the header include or in the head of showthread:
You can see it in action on my test site - its best to see it as a user - I have made a user id:
Name: testuser
Login: testuser1
http://www.leefish.nl/testfish/showthread.php?tid=5
w3c validation site was down - but I THINK it validates ok