I've never run ATF in the power steering system, but detergents aside, hydraulic fluid is hydraulic fluid, so I can't imagine it would be detrimental.

Many of the posters here swear by synchromesh. We don't have Revenol in the States that I am aware of, but if the manufaturer lists the T350 as an application, I imagine it would work just fine. The primary concern is friction modifiers for the paper syncho material, which most off-the-shelf manual transmission fluids don't contain.