I think it would be great if there were a prompt after you
select your sphere, just to verify.  

Sphere water (Y/N)?

Or something to that effect.  I have lost count of the times I
have been reading up on spheres, and typed 'help sphere
whatever' several times, and then forgotten the help ONE TIME
and accidentially chosen a sphere I didnt really want.

Example:

<100%hp 100%m 100%mv 4164tnl wilderness 1 PM> help 1779
'SPHERE LIST' SPHERELIST
The Spheres of Influence are as follows:
--------------------------------------------------------------------
(Snipped because you all know the list)
--------------------------------------------------------------------

See also: 'THE ELEMENTS' NATURE MAGIC 'THE SUN' PEACE 'THE
MOON' WAR
          'THE FORCES' 'GREATER VIRTUES' 'LESSER VIRTUES'
WIZLIST'
          'SPHERES'

<100%hp 100%m 100%mv 4164tnl wilderness 1 PM> sphere
water
You have chosen to follow the path of Water.

Do'h!
 

.

This has happened to me a few times, sucks having to reroll
because of it. :P