On the agenda at training will be getting Perofeta together with halfback Lindsay Horrocks, returning to the starting lineup this week and well known for his tendency for ad-libbing on the field.
"We'll get a bit more of that sorted tonight. We were doing a bit of running and covering fitness [on Tuesday]," said Caskey yesterday.
"The mood was good. We picked guys that are going to play rugby and want to use the ball. It's also hard to expect them to be perfect in wet weather conditions.
"We made a lot of handling errors, but they're trying to use the ball. Our kicking game could have been better."
To this end, trying to make sure the team gives themselves the best chance at victory with a crucial four-try bonus point, Bryn Hudson moves to No 8 as he hunts scoring in his third-straight match, hooker Roman Tutauha has again been preferred ahead of Cole Baldwin, and Daniel Fitzgerald starts at flanker after coming through his comeback from shoulder injury unscathed.
The midfield combination of Poasa Waqanibau and Trinity Spooner-Neera have swapped, which Caskey called a "common-sense" move.
"Talking about it was Jason [Hamlin, backs coach], Poasa is a direct, hard runner, and Trinity has a bit more imagination.
"Poasa's what you want in a second-five; he tackles hard and runs hard."
Kamipeli Latu comes back into the starting front row with Viki Tofa to the bench, while Fraser Hammond texted Caskey this week to say he is sure he is finally over the health problems that have dogged him for the past few weeks.
Halfback William Short and No8 Malakai Volou drop out of the squad this week.
While Thames Valley have never beaten Wanganui in the Heartland competition, up until two years ago there were six unions that had dubious honour, and now there are only two, so no match can be taken for granted.
"We never do, not in this competition," said Caskey.
"We'll keep it as simple as we can, there's always one job to do first [before four tries]."
After last weekend's draw, Wanganui must keep winning, preferably with bonus points, and hope either Mid Canterbury or South Canterbury slip up ahead of them on the ladder to get that precious home semifinal.
Thames Valley lost to Wairarapa Bush in Paeroa 36-9, then beat Poverty Bay in Gisborne 43-37 and East Coast 50-11 at home, before losing 47-12 to King Country in Taupo and 35-19 to South Canterbury in Timaru.
It's the second-longest journey in the round robin for Wanganui, who will be on the bus at 10.30am today for the trip to Palmerston North and flight up to Auckland.
They will stay in South Auckland before taking the bus south tomorrow for the 2.30pm kickoff.
