As a fan of Ultima since III, it pains me to ask about "jumping" in an Ultima game, but here goes... lol

In order to jump in U8 you have to press both mouse buttons. My problem is that on my Macbook Air there is the mouse pad where you cannot press both "right" and "left" mouse buttons simultaneously.

Is there a way around this? I've finally vowed to play this all the way through but without jumping (sigh) I cannot do this. Please advise. Thank you in advance.

It should be possible to set up a button or gesture in the OS mouse settings to do the both click function.

Thanks guys. I did try magicprefs, but I could not locate an option for both buttons. There is one for hold right and left buttons but it did not work in game. I'll try again though.
Magicprefs works now. I just had to re-download the newest version. I am now jumping in Ultima8! Thanks again for the help.