You can drag the "game" toolbar alongside the "file" toolbar, to save room at the top of the screen.
You can customise the colours used to show output from your MUSH by using: Game > World Configuration > Colours
You can customise the font used in the output window
You can customise the text and background colour of the command (input) window by using: Game > World Configuration > Commands
You can customise the font used in the command (input) window by using: Game > World Configuration > Commands
You can echo what you type into the MUSH in a different colour, to make your input stand out. Also, any aliases are expanded so you know exactly what is sent to the MUSH.
You can use "speed walking" to quickly move from one location to another. You choose what "prefix" enables speed walking. For example: /w 2N3E  will take you North twice and then East three times.
You can use "command stacking" to type multiple commands on one line. You can choose which character is used to stack commands together. For example: take sword; kill dragon
You can use the "notes" tab in the World Configuration screen to keep free-format notes about things of interest in the current world.
You can use the numeric keypad to quickly move around. The actual commands sent by the keypad are customisable by you.
If you use the numeric keypad, or commands on the "Actions" menu, then any command you have typed into the command area is preserved. This way you can use the numeric keypad to walk around, whilst typing in a lengthy command at the same time.
You can automatically log onto a world by specifying a character name and password in the "Connecting" tab of the World Configuration screen.
You can automatically send one or more commands to the MUSH when you connect (such as WHO)
You can use the "Activity" window to monitor all worlds (if you are connected to multiple worlds at once) and see if you have received messages from worlds other than the current one.
You can quickly switch to different worlds by using Ctrl+n where "n" is the "world number" in the Activity window. eg. Ctrl+2 will switch to World number 2 in the Activity window.
You can sort the Activity window into alphabetical order of any column by just clicking on that column heading. Click twice on a heading to sort in reverse order.
You can use triggers to highlight incoming messages by setting a trigger to match on a message prefix, and setting it to colour that message.