Skill trick: Swift Concentration lets you maintain concentration on a spell as a swift action, prereq is 12 ranks in Concentration.
Feat: Extraordinary Concentration lets you maintain concentration as a move action if you make the DC (25+spell level) and if you beat the check by 10 or more you can do it as a swift. Advantage over Swift Concentration is that there's no "once per encounter" limit, otherwise it's inferior.
The spell I had in mind doesn't let you actually do this, apparently, but it might be helpful. Aiming at the Target (abjuration) can be cast while maintaining concentration and it gives you +10 circumstance bonus to maintain concentration on the spell. Might make it easier to use Extraordinary Concentration and make that check. There's also a feat from Races of Stone that lets you take 10 on a concentration check at any time. How useful this is to the imploder, I'm not certain.
"Shit, the evil wizard is casting something. Quick, distract him, Brutus."
*Brutus, the Goliath Bloodstorm Blade, charges and hurls his greathammer at the wizard. Rolls a nat 20. Evil wizard explodes in a fountain of gore.*
"BRUTUS HATE WIZARDS."