The current glyph as well has the revamped on come Cata increases the duration of the effect by X amount. Here's my idea of a glyph that potentiilly benefits in Pve, but also is amazing for pvp.
Glyph of Riptide:
Decreases the duration of your Riptide spell by 5 second, but increases the initial healing by X%.
Viable tank healing, potentially more HPS in PvE, as well has increased surviability in pvp
Yes No?