The custom variable method was created to make creating custom variables relatively easily.
x->{L1+2}r is the same speed and size as
L1+2->oVAR : x->VARNote that you can abuse the custom variable system to create named constants, similar to finals in java, only you can actually notice the speed difference. For example,
32->oMapW allows you to use
oMapW in place of 32, anywhere in your code. Useful for debugging and clarity