unfortunately, there only exists a single universal highlight colour for the switchbar/treebar items (modifiable in Display options). it's possible to script this behaviour though, here's a small example:
on ^*:text:*:*:{
var %w = @ $+ $window($iif(#, #, $nick)).wid
if ($window(%w).sbcolor != highlight) && ($1- !isnum) && ($highlight($1-) == hello) .timer 1 0 window -g1 %w
}
this requires the highlight entry for 'hello' to have the lowest precedence (to be at the end of the list in Highlight options) otherwise messages containing both 'hello' and your nick will satisfy the given if statement, since
$highlight() will locate the entry for 'hello' first.
and you can use
on ACTION if you want this script to affect actions too. let me know if you want an example