Reflect motion from center of warp deformer

Currently the reflect motion options only allow:
- Center of canvas,
- Guide line,
- or rotation deformer.
When a warp deformer's default position is rotated with CTRL+click, it makes it impossible to reflect motion across the warp deformer, as instead of reflecting accurately, the warp will be distorted. Rotating warp deformers can be very useful for specific parts that are at a severe angle, such as some hair pieces, in order to deform them more accurately according to the shape. However, the trade-off is that the motion has to be manually made on either side. If the option to reflect motion according to the center of the current warp deformer was given, it would save a lot of time and labor in these circumstances.