I see that the issue is documented here: https://github.com/scottjehl/Device-Bugs/issues/25
Given the issue, I can not think of any easy way to work it around. I rewrote our whole JS library keeping performance in mind and for this small userbase, it would be an overkill.
So right now I am labelling it a won’tfix. I will try to look more into it once I manage to borrow an iPhone 5.
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