For whatever reason my mouse is frequently drawn to the close tab button and as a result I tend to accidently close tabs all the time. It happens frequently enough to be really annoying and compounded by the fact that I can't reorder tabs once they are opened [another bug, in fact]. What I would suggest is to (a) move the X out of the specific tab and over the the right ala firefox. It seems to be "the right thing" these days. Second it would be nice if closing would ask "Uhh, are you sure?!". Finally the second point is bound to be annoying to some people so it should be configurable. Reproducible: Always Steps to Reproduce: Use the terminal, open a tab, click X, watch everything go away w/o any prompting, become sad. Actual Results: ... the tab closed w/o prompting. Expected Results: See Details.
There's a hidden option "MiscTabCloseButtons" (see http://www.os-cillation.com/documentation/terminal/C/advanced.html#hidden-options), maybe that's what you are looking for?
Hmm, that seems to sufficently work around the bug.
Resolving to WONTFIX then.