p = perpendicular
, I would like the ability to change the typing to a single letter as well.
However as a work around I use the F keys F3=non (it already does this),F4=nea,F5=per,F6=cen,F7=end,F9=mid,F12=tan.
Been doing this for 4 years and it has proved to be a good system.
The order is basically the order of use, since I use running osnaps (with nea and per not selected) nearest and perp are the first 2, they also cause the most havoc when selected as osnaps.
Cen was next as it saves a ton of panning with large circles.
The cui has the ability to change the keys to what you want.