DPS display could easily be solved with a system already in game.

[Synestra]

While DPS is an important metric for some jobs, it is often just one of many, and the problem with DPS meters is that it only shows you that one. It is often times more important to be doing the RIGHT thing than doing crazy DPS, especially in this game.

Besides DPS current parsers also shows what skills you have used and their order(pressing skills in random order is rather common for some reason >_>)and damage taken, so not only does it show your DPS it also shows if you are derping. But what comes to SE made parser i think its not really needed as it would propably be inferior to current ones, and those who really cares for self improvement already uses tools currently avaible.