my 2cents,
vocal booths are great for creating your own environment from scratch, if you record in a room that's not treated you will get natural reverb. i'm not saying recording in an open room is bad at all, because i used to do that and i've heard plenty cd's done this way. there are a lot of people like MF Doom who just has his mic in the middle of his room for recording. for budget sake, if you don't mind the natural reverb go for it, but if you are a strictest or stickler and you want to shape raw vocals with no additives then, investing in an acoustically treated area is the way to go.
yeah, hitting record with the 10sec precount is some funny shit indeed, but it get's my blood pumping when i make it back to the booth, and since my vox were warmed up and now i'm warmed up i'm ready to slay the mic.
try getting a wireless keyboard and mouse, learn the short cut keys, or program your own short cut keys and you are set. just buy or build a stand to hold your computer keyboard waiste hight in or right outside the booth and you should be good. I don't know if the receiver will pick up the RF transmissions through a wall, maybe a sheetrocked wall but not a brick or stucco wall. this is all in theory btw.