Hi SESI.
After discussing this with some users of the forum:
http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=50960#50960 [sidefx.com]
I think that a virtual time slider like in Maya, the k hotkey, will be great so the user can change the current frame pressing some shortcut in any part of the tool and dragging.
Specially for animation, a field where houdini is improving a lot, is quite interesting.

Thanks