Make auto-enclosing in parens better.  Keeps lots of double (( and )) from happening.
leading spaces...the autocommands for sqrt/nthroot/sum get smashed right into what preceeds it.  Normally this is not an issue, but in weird circumstances (often with supsub) it can lead to text output like x_tsqrt(2).  leading space makes it x_t sqrt(2) which is more readable and has the implied multiplication.