I am installing a new bathtub that is big enough for two people. with one person leaning against each end of the tub. So I want to have the shower head in the usual position at the end of the tub, but the tub-filling spout in the center of the long side of the tub.
I'm thinking I can I just use one valve/faucet set with a diverter, like the usual setup. I'm thinking the valve/faucet should be closer to the spout. So then, the only difference (than the usual arrangement) is that the pipe from the valve to the shower will be quite a bit longer. The issue is, would the pressure drop to the shower head be such that the flow is too low ? If I understand, shower flow is limited mostly by the shower head, so if I installed a high-flow shower head, maybe I'd be ok.
But if not, if the shower flow would be too low that way, I'd consider installing two completely separate valves/faucets, one for the shower and one for the tub spout. It'd cost a bit more, but it wouldn't be that much trouble, because there are already pipes coming up along the long side of the tub, because the washing machine is on the other side of the wall.