The list of Hot Keys is in the Help file.
In the Powerdirector interface, click on the "?" in the upper right of the screen. Or press F1.
Contents Tab
Expand Appendix > Expand Hot Keys.
You can print the topic if you wish.
There is no Hot Key for Split.
Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.