If you use "/msg ChanServ kick #channel nick reason" you can specify your own message that if you have a BotServ bot in your channel will be used to kick. If you dont want your nick displayed in the reason turn sign kicks off for the channel using "/msg ChanServ set #channel SIGNKICK off"
As for customising the reasons that BotServ uses automatically with its kicks for flooding, repeating, caps, etc.. it would be nice if you could configure those.
[Edited on 1-10-2006 by Jobe1986]