Many other live coding languages allow for per-block or per-line execution of code. Maybe this is something to look into to help create different sections in a performances/piece that can executed separately. For example use a part or section keyword:

part start
  new sample kick_909 time(1/4)
  new sample hat_909 time(1/8)
part end

Or maybe simplified with parenthesis or curly brackets

{
  new sample kick_909 time(1/4)
  new sample hat_909 time(1/8)
}