Since picking up MuseScore very few things have prompted me to look back at Sibelius and pine for some old functionality I'd grown accustomed to. One of those things is the Sibelius 'alt click' command. You can highlight a series of notes or measures and then 'alt click' on any other measure in the score and the notes will be copied and pasted on the place you clicked. It is phenomenally useful and saved me tons of time when engraving scores with any amount of repetition. Unless I've overlooked some preference, MuseScore doesn't support this action. But then I remembered AutoHotKey!

Once I remembered that this program existed, it took me about 20 seconds to solve the problem. Here is the script I created. Save it as a file with the extension ".ahk" and then run the script. Then think of me when you're sipping your Strawberry Daiquiri by the pool thanks to all the time you saved copying and pasting in your music!

alt & LButton:: ;for MuseScore - emulates alt-click copy
{
    Send,{CTRLDOWN}c{CTRLUP}
    Send, {Lbutton}
    Send,{CTRLDOWN}v{CTRLUP}
    sleep,500
}