You can adjust the onscreen (software) keyboard on iPod touch. If you use an external (hardware) keyboard with iPod touch, you can customize keyboard shortcuts and change settings such as the key repeat rate.
If you have difficulty seeing the onscreen keyboard, you can set it to display only uppercase letters.
Go to Settings > Accessibility > Keyboards, then tap any of the following:
Key Repeat: You can adjust the repeat interval and delay.
Sticky Keys: Use Sticky Keys to press and hold modifier keys, such as Command and Option, as you press another key.
Slow Keys: Use Slow Keys to adjust the time between when a key is pressed and when it’s activated.