It seems like the recent Mavericks update has broken the keystroke command in applescript -- whenever my script reaches that point, it freezes. (I currently have ~20 zombie osascript processes...)
Furthermore, there isn't anything in the accessibility options to allow applescripts to automate keystrokes.
This is my script currently.
tell application "Terminal" activate end tell delay 0.1 tell application "System Events" to tell process "Terminal" keystroke "t" using command down end tell tell application "Terminal" do script "cd ~/some_folder_here" in front window end tell
If there's a way to tell terminal to directly open a tab (or if iterm 2 can do that) that could also be a solution.