There isn't much of a point to SB pets, FYI. They don't receive recharge buffs anymore, so about the only thing it would actually be doing is to make them run faster. Though I don't know the actual answer to your question, I thought that might be pertinent.
/bind KEY "targetcustomnext mypet imp"
That will target your closest Imp. Pressing it again will target the next closest (from it's current position). If the pets are moving around, it might not cycle to each one "correctly", but since you only have 3, it shouldn't be a big problem to just press it again to cycle through.
Direct from my Fire/Kin's keybinds file:
SHIFT+NUMPAD1 "petselect 0"
SHIFT+NUMPAD2 "petselect 1"
SHIFT+NUMPAD3 "petselect 2"
The numbering of pets works the same as the numbering of costumes: The first pet is 0, not 1.
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Biggest Troll on the forums? I'll give you a hint:
Is there a bind to target my pets, say fire imps.
What about to target them and rotate between them?
Would be helpful for speed boost