I understand that my ?/6 staff of conjuration recharges faster than my ?/3 staff of blinking, but it'd be helpful to know exactly how fast they charge. Is this information documented or known to anyone?
According to the documentation on the site, all staves charge over a certain given timeframe). This means that staves with more charges seem to charge faster. I.e. if a staff takes 10 turns to charge to full (regardless of # charges), then one with 3 charges appears to get one charge every three turns, but one with 6 gets 1 charge every 1 and a half, giving the illusion of charging faster.
I looked through the source code, and it appears that the recharge rate depends upon any wisdom bonus you may have.
rechargeIncrement = (int) (10 * pow(1.3, min(27, rogue.wisdomBonus))); 10 if no wisdombonus.
A specific comment within the code indicates that at level 27, items charge to full in one turn. Staves of Blinking and Obstruction charge at half speed.