You can override any shortcut in Stashpad to make it work exactly right for you.
Open Shortcuts menu
To modify a shortcut, first open the shortcuts menu by hitting ?. Then click the "Edit" button. You're now in editing mode.
Next, hover over the shortcut that you'd like to customize and click the pencil icon that appears on hover:
Stashpad is now waiting for your keyboard input, and the next keystroke combination will be set as the new hotkey. Click the save button to finalize your selection:
Click the revert icon to revert a shortcut to its default value: