Toolbar Button for "Add to Index"

I make CHM (context-sensitive help) using RH8. My SME wants an index (it's quite heavy technical stuff) and I add index keywords by:

* select text in the topic,

* right-click,

* Add to > Index Keyword > ProjectName.

If I could make a toolbar button for this I could let my SME create the index himself.

Is there a way of creating a custom toolbar button in RH8? Alternatively, is it possible to carry out the above procedure using the keyboard (no mouse)?

aTdHvAaNnKcSe

--- Derek