With AI and the step mode command '-s':

According to the spec. it's possible to say:
    ai -n new_vic -s
and...
    ai -s new_vic
or...
    ai -s new_vic old_vic this_vic that_vic

But, you can also say:
    ai 
and create a new unnamed VIC at the next id
So logically you can also say:
    ai -s
to mean "new unnamed vic in step mode".
But this already means "all vics in step mode"

Also I could validly enter:
    ai -s -e
Is this stepping a vic named "-e", or creating a new vic 
in step mode with an error log!
Similiarly I could also enter:
    ai -s default.pk foo.iq
Am I stepping the vic named 'default.pk' (and 'foo.iq') or
creating a new one with the given pk/iq files?!

Also there's no delimiters for the vic list,
Currently I have implemented '-s' so that it expects only
one argument.  If you wish to specify multiple VICs for
step mode, they have to go in quotes:
    ai -s "this that the_other"
e.g.:
AI> ai -n larry
Created 'larry.1'
AI> ai -n moe
Created 'moe.2'
AI> ai -n curly 
Created 'curly.3'
AI> ai -s "larry moe curly"
larry.1 step mode
moe.2 step mode
curly.3 step mode

I believe instead of having a dual-purpose '-s' either make two seperate
commands or enforce an argument on the non new-ai command, so to step
mode all existing VICs you enter a command like:
    ai -s *
or maybe:
    ai -s all

Also: once step mode is set, is there a command to turn it off ?
if the user step-modes something already in step-mode does it toggle?