If they boost Jump/High Jump damage significantly and also make them grant bonus TP, it would be worthwhile.

Jump 1.5x TP
High Jump 1.5x TP
Spirit Jump 2.5x TP
Soul Jump 3.5x TP

Under Rouse Wyvern
Jump:2x
High Jump:2x
Spirit Jump:3x
Soul Jump:4x

I think that would be fair.