Is what your talking about 'Justification' ?

If, so you can use something like;

alias just {
; /just nick #chan text
var %d = $calc(83 - ($len($1) + 4))
var %l = $len($3-)
var %i = 1
while (%l >= %i) {
echo -mbflirtc normal $2 < $+ $1 $+ > $mid($3-,%i,%d)
inc %i %d
}
}

/just nickname #channel text

Placed inside an 'On Text' would justify peoples text and halt mIRCs.
i.e.

On ^*:text:*:#:{
just $nick $chan $1-
haltdef
}


Eamonn.