I love Terminal most of the time, but wanted to punch it the other day.  :-)

While trying to move a tab I accidentally clicked the mouse on one of the "Close this tab" buttons and completely lost my place, my current work, and my bash history.

When I went to try to disable the close button in Terminal's preferences, in order to prevent problems like this in the future, I found that there was no such option.  It would be really nice if one could be added.

Most multi-tab consoles provide the capability to disable close buttons on tabs (e.g., roxterm, terminator).  KDE's konsole goes even futher:  1) there is a single "close tab" button on the tab bar, which applies to the active tab (helps make accidents less likely), 2) the close tab button can still be turned off, and 3) if you press close tab on a tab that has an app running in it, it pops up a dialog asking you to confirm the "close tab" action.

Adding the functionality that KDE has is probably overkill here.  But a simple preference to disable the close buttons would get the job done and (hopefully) not be to much work.