Capos normally change the voicing of chords and can help you change keys if necessary. Listen to James Taylor for acoustic use of the capo. Try Ry Cooder when he plays
slide in drop "d" tuning. He often uses a capo on the second fret on his stratocaster. You have to check the radius of your fretboard on both your acoustic and your electric. I have a Larivee acoustic made in the 80's with a very wide flat fretboard. Conversely, my stratocaster has a radiused fretboard (rounded or crowned on the top). The point is make sure that the capo you use will provide equalized pressure on each of your strings. I used to use a double elastic/eyelet type for my Larrivee, which worked as well or better than some of the mechanical types of capos. I had to lower the pitch of the b string, however, in order to correct the intonation. I have sinced switched to a Shubb capo (either brass or chrome available). They seem to work the best of any mechanical ones I've tried. Intonation seems very good with little or no adjustment of tuning. They cost about $20 -$25 canadian. (sorry about the currency).
Good luck.
Bolerama