Is it possible to open new files in new tabs rather than opening a new window each time a new file is opened?
If not possible in Mousepad what would be the next best light weight text editor that supports opening new files in new tabs?
Yes, mousepad 0.3.0 does support tads. I haven't found a short cut key for it yet, but if you chose File > Open or File > New, it automatically opens in a new tab. So Ctrl + N or Ctrl + O would be the closest thing to a Ctrl + Shift T