[roguebfl]

Personal what I allow my player to do is when then have enough points in skills, where they if the can move skill points out of the skills into their controlling Attribute Without lowering the skills that the points are being taken from, the can do so.

for example, you have 5 IQ based Skills at [8] each, you can reduce them to [4] each to buy IQ+1 [20] leaved the base skill lives the same.
or foe Example 20 Skills at [2] can be lowered to [1] to by the IQ+1 [20], or any other combination in between.

I based this on the discretion of buying skills from default. To me this represent you have but enough work into the various skills that ever work out a few patterns that you can now generalize to other situations, hence improved the attribute.