Considering they can't be styled by any other method but overriding the alias, you can easily do:

Code:
alias msg { .!msg $1- | if ($show) echo -atm -> $+(*,$1,*) $2- }
alias notice { .!notice $1- | if ($show) echo -atm -> $+(-,$1,-) $2- }


So the feature is already doable via scripting.

- argv[0] on EFnet #mIRC
- "Life is a pointer to an integer without a cast"