I haven't created a "Leaping" or "Longjump" spell yet but with CoM it should no problem. A different method might just be to learn the jumping skill and use a "boot ..." spell on the relevant stats or a "Bless" to get a higher result in your manoeuvre.
College of Magics, however, is probably the best solution for this.
As for a simple solution I would use the "Landing" spell as the basis for the spell. According to RM the Longjump spell in its basic form would allow a jump of 6' high and 10' long. Use the 3 PPs as for the Landing spell and add scaling option of +2 per extra 10' in length or 3' in height. As for the ever popular "feet per ranks" scaling option I have to check with CoM as I cannot seem to find a good solution for that just now.That to me seems a sensible solution and working spell cost.