Hi,
Yes, this can be done! But you'll have to modify the plugin CSS stylesheet. That's not a feature I'll add in the admin panel.
If you wan't all slides to go from left to right:
- copy .da-slide-fromleft styles in .da-slide-fromright
- copy .da-slide-toright styles in .da-slide-toleft
Doing this you'll only have transitions from left to right ;)