Hello, Liam.
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So? IS my DM / REGEN Scrapper still viable?
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Yep. You'll see a lot of DM/Regen Scrappers during your return.
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DO i need tough / weave now? etc etc
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Tough and Weave are great powers and will be very efficacious at supporting you for being /Regen.
Hasten from the Super Speed pool is definately recommended. It will give you a 70% global recharge buff that last for a duration of 120 seconds. Therefore bringing your /Regen powers up a lot faster.
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also can we still perma DullPAIN
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Yes - Dull Pain can be still be perma. This would require set bonuses (from set IO's) and Hasten, though.
I'd recommend you have a look on http://cityofheroes.wikia.com/wiki/
It will display informtion regarding to nearly every topic in CoX!
Here's the linky for invention origin enhancements (IO's) click me
Once you've read that, download Mid's Hero Designer (known more well as simply "Mid's") from here... click me
On Mids' you can create builds and then post them here for us to inform you what's needing to change etc 
If you have anymore questions, contact me in-game at: @JeffJeffityJeff
I remember Mazimba I think...
WB. 
I remember you mate 
I have been away for a good while, i played back in beta to i4, returned many times and now im back again! - and im lost.
So? IS my DM / REGEN Scrapper still viable? I used to have a lvl 50 Called Mazimba * now deleted * - and ive got one now at lvl 29 ... and im looking into which way to go slot wise? DO i need tough / weave now? etc etc
Any info posted would be great.. also can we still perma DullPAIN? OH - PvE builds would be awesome.
Liam