If you want a AoE taunt, use the https://homecoming.wiki/wiki/Presence : https://homecoming.wiki/wiki/Presence#Provoke
Super Reflexes is based around avoiding attacks and not drawing them to you. It was one of the original power sets in CoH.
I think all the scrapper primaries have a power to pull a single target and all (or most of them) have AoE and/or Cone powers to draw agro even if they don't have a threat component.
I like Super Reflexes the way that it was designed.
The scrapper archetype isn't built to be an agro magnet - that was intentionally limited to tanks up on release of the game and then given to brutes so villains would have an agro magnet in their archetype picks..
If you look a the scrapper AoE powers that have a taunt component, they are usually doing more of something else and are generally too weak to hold the agro if a blaster is AoE-ing or cone-attacking things.
Scrapper taunt is nowhere near as powerful as a tank. Brute taunt isn't as powerful as a tanks, but they still have a more powerful innate taunt than scrappers.
Tanks can have super reflexes at this point, but even they don't get a taunt aura, but, then again, the whole point of super reflexes is not to get hit in the first place ... so why are you trying to attract agro?
That being said, unless you are just end gaming and trying to draw excessive numbers, the tanker taunt with a recharge in it does enough threat to hold the agro on most mobs continually.