try this: //echo $uptime
...and mIRC will tell you this:
* /echo: insufficient parameters.
I think mIRC should be able to echo this number....especially because it's mostly not a valid color-value.
Of course I could use -a or -s everytime.
But it would be more handy.
P.S.: I'm using this 'workaround' atm:
echo {
if (!$2) && ($1 isnum) { echo -a $1- | halt }
!echo $1-
}