Shell access (e.g. ssh) to server - NOPE
InnoDB storage engine - NOPE
set_time_limit() NOPE - The PHP time limit was set to 20 seconds for fair usage reasons, so it’s not possible to increase it. Our servers are pretty zippy, so 20 seconds is enough for almost all purposes
escapeshellcmd() NOPE - any kind of shell access is blocked
iFastNet’s premium hosting does give access to InnoDB and set_time_limit() functions.
SSH access to the servers is not available with premium hosting, only with their Business Hosting plans. But I’m not sure why Humhub asks for SSH access, since it can already execute code on the server itself.