customizing ess 5.2.2 toolbar

[Jack Tanner]

ESS 5.2.2 adds a few buttons to the Emacs toolbar, but my Emacs window 
isn't wide enough to accomodate them, so they expand onto a second line 
of buttons. I'd like to either remove some ESS buttons, or, if that 
can't be done, turn off the ESS buttons entirely.

There's also an irritating behavior with the added buttons that wrap 
around to a second line. This is an Emacs problem, not an ESS problem, 
but it's ESS that invokes it in this circumstance. Feel free to forward 
this to upstream Emacs folks.
- Load some R code in Emacs, and M-x R
- The Emacs window is split into two, with the R prompt in the lower buffer
- Click into the R buffer
- The ESS toolbar goes away, revealing more source code in the top buffer
- Click back into the source code buffer. The ESS toolbar shows up 
again, effectively scrolling the source code down. But because you just 
mouse-clicked and the place where you clicked gets moved, your mouse 
ends up selecting a region! (At least with transient-mark-mode t.)