I would just connect it to the mixer without reducing it to 3/8".
There are lots of fittings available that are needed to fit a corner shower rod. The only problem is is that one has to know the right size of the fittings that are needed. So it depends on the size of the corner shower rod as well.
If it is indoors and not a recessed shower, you may have a leaking shower pan.
Yes as the short radius fittings offer greater friction losses
You can reduce the time you take in the shower.
Moen and Delta shower controls are similar. Either one can be fitted in same locations. Both have versions for soldered pipes, threaded fittings , or PEX fittings. Both companies make a huge range of controls, so there is something to suit everyone.
The best way to reduce sweat in a fast way is to take a shower.
Ideally, you should shower daily.
Depends what shower you have.
The drains for the shower, toilet and sink all connect to a common line. Assuming the toilet is not backing up, the problem indicates that there may be a partial blockage, enough so that some of the toilet flow is backing up through the shower drain line. You need plumbing repair. The shower leak you mention should only be in the shower, or else you have a broken drain line as well.
No, You Should Actually Eat Before You Have A Shower, Better For Your Digestion.
Kohler manufactures several unique and distinctive shower fittings and heads. The rainforest shower head was first developed and produced by Kohler and has since been copied by various other manufactures due to its arcing water spray pattern which would envelope the user.
Yes normally no less then 2" diameter and and 11/2 vent line depending on developed length of piping and fittings