The only pointer I can think of is: when the drummer is performing, the tech must maintain focus on the drummer and his kit. They can't be distracted by anything else. When (not if) something goes wrong, the tech must be quick to resolve the issue without letting the problem disrupt the performance. Quite the task, IMO!
My first glimpse of a drum tech was at a concert in the 1970s (I forget the artist). When the backbeat stopped during a tune, the drummer looked to his left and within a couple seconds the tech was up there pulling the snare drum with snare stand out, stepped down, and in another couple seconds came back up with a replacement snare already attached to its stand, placed it between the drummers legs, and got the "good job" nod. I thought this was fantastic, and I also learned that good snare stands hold the drum securely (unlike my pawn shop special).
And don't forget about those times when the drummer is sick and the tech fills in.