I have a Peco switch which routes power as the switch is switch, which leads into a sliding I want to use to park engines.The layout is run by DC.Is it ok to cut gaps into the rails to make blocks wired to an Atlas selector?

I recently had a problem with short circuits on a module and with the help of members here I traced the problem to two Shinohara turnouts that had a dead short between the outside rail of the diverging route and the inside rail of the through route.  I chalked it up to a defect and replaced those turnouts with a couple Atlas turnouts and that solved the problem.

I am getting ready to wire my new layout for DCC. This is my first round with DCC so I have a couple of questions:

-I have 10 ga stranded wire and 12 ga solid wire on hand. Would either of these be appropriate to use for the main Bus?

-What is the lightest feeder wires that I should us? I have some 24ga wire on hand.

Thanks in advance for the input

I'm wondering what solutions (home-brew or commercial) there are out there that use wireless to communicate (bi-directionally) between throttle and train and use the rails only for delivering power. 

Not DC where the track voltage is varied to control speed, but constant-voltage rails where the loco is told (wirelessly) to draw whatever current it needs to go a given speed. And not DCC with control data sent via rail.