I've done that, however the problem with renaming the net is that if you copy/paste the symbol as you would all-over the schematic, it reverts back to the "V+" net name. So the problem is that if you have a bunch of nets on a sheet named "+3V3" and copy/paste the "+3V3" symbol and connect it to the net, it will rename **all** the nets on that segment to "V+", which you then have to go through and rename/verify.
It's incredibly annoying to have a sheet full of properly named +3V3 nets then add one "+3V3" symbol and it renames all your nets to "+V" (if you pick the wrong option in the dialog) (which may clash with something else you didn't catch). To illustrate the point, here is a real example of a problem:
When I did this I picked the symbol from the "Add Part" dialog from the Power_Supply libraries and connected them all up. Little did I know that these were all "+V" nets, not 1V8 or 3V3, or 1V15, they were all the same. Because these are direct pin connections (caps are elsewhere on the sheet) it didn't warn me at all, it happily connected them up.
It wasn't until I saw this that I realized that my power supply was all shorted out:
And because of the saving problem (which has now hopefully been fixed, but is honestly still a mess because you can version individual parts of a schematic different from the overall file by saving in the wrong place), I never knew if I had fixed what I had or if it magically reverted back to an older version.
So right now the only work-around is to use the old libraries, the new one is unusable because when you connect the two together (+V and 3V3) it just confirms you want to connect them, then it changes the name to +V which you have to go back in and change again.
By the way this is a problem with all the new libraries, not just Power_Supply. Dropping a capacitor from the Capacitor library should not give a U$1 name, it should be C1, and attempting to give it a value says that there is "no user definable value", which is completely incorrect for components like caps and resistors.
