Good points but each point is 20 or more years old. He HAD anger issues, he HAD drug problems, he HAD been in the shadow of Corey Haim. The question is, what are his issues today, rather than then.
What's odd is that there must be directors out there who grew up enjoying the films that Feldman was in such as Stand by Me, or The 'Burbs or The Lost Boys, and not necessarily small-time directors but ones making bigger features. It's odd none of them would just put Feldman in there in a supporting role or even for an ironic cameo like Neil Patrick Harris did in Harold and Kumar.

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