I wouldn't mind a jump as long as you:

a) Can't SPAM it. Lets not be like WOW where mashing the space bar becomes an obsessive tick rather than an attempt to circumvent obstacles.

b) Jump a reasonable height. Hop would be a better word for this feature than jump. Let us get over those knee and ankle high walls and put an end the tyranny of the poorly placed rock outcrop.

Note: Mario does not have a reasonable jump height, nor do gnomes or dwarves who practice the craft of war.