Hmm or something altogether:
check here
http://www.mdma.net/hyperthermia/mechanisms.html
here though, it's associated again with 'vigorous physical activity such as dancing'
http://resources.metapress.com/pdf-preview.axd?code=j1824276l6k29620&size=largest
yet, adrenoceptors (adrenergic receptors) also may have something to do with it
http://www.knockoutscience.com/showabstract.php?pmid=16025144
MDMA may initially induce hypothermia, very interesting when we consider the shivers one might get from such drugs in the very first stage of effects!
In the following, "The cause of hyperthermia (MDMA; MDA) could not be determined."
http://www.aapsj.org/abstracts/AM_2005/Staged/aaps2005-000515.PDF
I hate to say it but hyperthermia is not the main topic here. Either I am missing something or cases of hyperthermia are very complex and while I may be wrong about the thermostat theory (I really thought hypothalamic activity was affected for some reason I guess??) it still seems to be a multi variable equation.
So getting back to the actual direct neurotoxicity of phenethylamine stimulants that may be used as MDMA substitutes (whether they hardly live up to expectation like pure serotonin releasers or otherwise), hyperthermia is not a primary concern although it may be a risk for many other recreational drugs. Including amphetamines that focus much more on the dopaminergic system (and NE I think right?).
Something to consider is that MDAI reports are not really that glowing, but some combinations with dopaminergic releasers or reuptake inhibitors have been said to be worthwhile.
Looking at both possible causes for hyperthermia as well as general neurotoxicity such combinations might not prove to be such a good alternative for MDMA other than legality. On the other hand, it's always a good thing if you take something that doesn't rape your SERT like MDMA does, but it might cost you some feelings of magic.
With the limited information I have seen it has always sounded like a tradeoff, you don't easily get something for nothing. But now and then you hear about non-neurotoxic compounds that substituted for MDMA... everyone is welcome to mention one that has been bioassayed and actually proved worthwhile.
Then we have a good example and we can try to investigate if it really does have to positives of MDMA (or many of them) without most of the negatives.