I use Todist and Evernote.
Shortcuts are overlapping.
For example Ctrl + Alt + T = Make Tag in Evernote.
Can I Change the Todoist Shorcut?
Yes. You can change it by looking for the Todoist icon in the System Tray. Right click it and select configuration to change the keyboard shortcut. I've attached an image so you can see exactly where you need to change this.
windows app - configuration.png (187kb)