lol you need what we call "popups" which is the context menu you want just type alt+r and go to the popups tab and click on view and choose channel on there you can type the following:
test:/say testing popups
also you can type:
test
.say stuff:/say stuff
whenever you use a dot that means a submenu will be created under the word which has no dot and the more dots you add the more sub menus you will have like this:
test
.sub1:/say test1
..sub2:/say test2
...sub3:/say test3
.test2
..sub1:/say test4
notice that when you dont use the " : " it means its a menu with sub menus
as for the clicking the letter it would be better if you add all the above stuff in the nicklist and thats if you click view > nicklist instead of view > channel and what that does is that whenever you choose a user in the nicklist on a channel it will bring up the menu you want with the popups you specified so all you do is click on the desired popup and thats it