The only problems I've had with GoDaddy (economy Linux hosting) is with mod_rewrite. They prevent rewrites of PHP files including any forbids (403) you might want to give spammers. I have not bothered with friendly URLs so have no info about that. Here are a few recent comments from GoDaddy support.
"...SBOX rules are taking priority over the rewrite rules. This is preventing your DENY IP from functioning properly. Basically rewrite rules will not work on PHP files becuase our SBOX rules are preventing this."
"I apologize for the inconvenience however the SBOX will stop the mod_rewrite, and I have sent this information to the developement team."
"There are no current plans to change this policy. As a large hosting provider concerned with security, reliability, and ease of support for our hosting packages, we have chosen to disable this function..."
I have been reminding them about this situation from time to time, as recently as yesterday. Their latest reply was "Thank you for your feedback and suggestion. As we highly value your ideas, I will forward your information to our developers for consideration." Which they've said before, of course!
The trouble is, I don't think they do intend to consider changing the policy. I've yet to have an adequate explanation (indeed, any explanation) from them as to *exactly* why they prevent PHP rewrites. Nor have I found an explanation anywhere as to why SBOX is being used (SBOX is a CGI wrapper script) like this.
If anybody here has some technical suggestions as to how GoDaddy might be convinced to lift the ban on PHP rewrites, I'd be pleased to hear them. Anybody have experience of SBOX? Is GoDaddy using it incorrectly? AFAIK, only GoDaddy hosting is using SBOX to prevent PHP rewrites in this way.