Thanks for the reply, Daniel.
I am a bit confused here with the different 'Bone' hands available.
There are for example: Martha_palm down, Marth_palm up, Marth_palm front.
By your saying "If you want to use different gestures on the same character, using the Hand Pose Editor should meet your needs."
I take it that any one of them (eg. Martha_palm down) can do palm up as well.
YouTube Tutorials Here