I got the feeling from reading the discription that The Gate of Infinity is one way. Also u could drop Demolition packs packs though a gate in one round and then close after. I had some scary thoughts of Damage what could happen at the place where the gate exited. Also thinking Tua do not really use physic powers so would unlikly to have wards against this.

Also discovered from a game i watched Machine curse is very useful against Tua skimmer and tanks. They tend to explode when they drop out of the sky when they are not at ground level.

Well, in the tabletop rules, the only Tau skimmer that would be destroyed upon a successful "Immobilized" roll would be a Piranha (or Piranha TX-42) moving flat out, that is, over 12" on the table.

Machine Curse, in Table Top, really seems to me to be best used against high AV targets that one otherwise has difficulty penetrating - Monoliths, Land Raiders, Battlewagon and Leman Russ front facing, etc.