for TKL, you can get away with folding the membrane. you could even go 75% (no tenkey and no navigation) with just a single fold. but a real 60% (no tenkey, no nav, no function) pretty much requires custom or modified membranes because two folds always seems to cause ghost keys or other failure.
if you want to go 60%, you might read my thread on custom BS membranes.
http://geekhack.org/index.php?topic=40111.0Hasu did the code for my M60 so it should not be difficult to add trackpoint support.
