It would make things like sharing important information from one person to another faster. A side note about that is a lot of other websites have some pretty neat messages features... Lots of fun in my opinion.
I deal with flood control problems.... For me it means I'm putting in a good few hours of work. When something goes wrong and I trigger a long time flood control... Yikes. Being able to preview and choose my options could save me from
running into long lasting flood control.
Well..
I could be wrong but I feel like seeing more of my messages or having the option to do so wouldn't necessarily hurt this site. To be honest I could even go with JSP filtering my msgs into different folders for me. I think the only option for that to happen is if the messaging system gets a user friendly feature upgrade.
As for using multiple tabs.I use them... But every device and every browser does things a little differently than the next. Have you accidentally exited an important message you were writing? Super easy to do on a cell phone....