TD-27: Can I adjust how easy it is to play head shots and rim shots?

Yes.
Perform the following procedure.

1. Press the [SYSTEM] button.
   - The SYSTEM screen appears.
2. Use the cursor buttons to select “TRIGGER,” and press the [ENTER] button.
   - The TRIGGER MENU screen appears.
3. Use the cursor buttons to select “PARAM,” and press the [ENTER] button.
4. Move the cursor to the “Head/Rim Adjust.”
   * For some Trig Type settings, this cannot be specified.
5. Use the dial to specify the value (0-80).
   - Refer to the “Head/Rim Adjust” parameter in the TD-27 Data List (PDF).
6. Press the [DRUM KIT] button to return to the DRUM KIT screen.