It might be possible, and I did start down that road, but the query got pretty scary. I think I'm more comfortable with multiple queries, but maybe I'm wrong. Here are all the queries, the first generates the client list, the rest populate the integer fields:

SELECT c2.id, c2.name as 'client'
  FROM client c2
  WHERE level = 50 and status = 1;

SELECT c2.id, c2.name as 'client', count(*) as 'ext' 
  FROM client c1, client c2
  WHERE c1.level=100 AND c1.status=1 AND ext.type = "phone" 
   AND c1.parent_client_id = c2.id
  GROUP BY c1.parent_client_id ORDER BY c2.name;

SELECT c2,id, c2.name as 'client', count(*) as 'vm'
  FROM extension ext, client c1, client c2, extension_prefs exp
  WHERE ext.client_id = c1.id AND c1.level=100
   AND exp.param="voicemail"
   AND exp.value=1 AND c1.parent_client_id = c2.id
   AND exp.extension_id = ext.id
 GROUP BY c2.name;

SELECT c2.id, c2.name as 'client', count(*) as 'ivr'
   FROM extension ext, client c1, client c2
   WHERE ext.client_id = c1.id AND ext.type = 'ivr'
   AND c1.status = 1 AND c1.parent_client_id = c2.id
   GROUP BY c2.name;

SELECT c2.id, c2.name as 'client', count(*) as 'queues'
  FROM extension ext, client c1, client c2
  WHERE ext.client_id = c1.id AND ext.type = 'queue'
   AND c1.status = 1 AND c1.parent_client_id = c2.id
  GROUP BY c2.name;

SELECT c2.id, c2.name as 'client', sum(if(value<11,1,0)) AS "conf10"
  FROM extension ext, client c1, client c2, extension_prefs exp
  WHERE ext.client_id = c1.id AND exp.param="conf_size"
   AND ext.type="conference" 
   AND c1.parent_client_id = c2.id AND exp.extension_id = ext.id
  GROUP BY c2.name;

SELECT c2.id, c2.name as 'client', 
 sum(if(value<20 AND value>10,1,0)) AS "conf20"
  FROM extension ext, client c1, client c2, extension_prefs exp
  WHERE ext.client_id = c1.id AND exp.param="conf_size"
   AND ext.type="conference"
   AND c1.parent_client_id = c2.id AND exp.extension_id = ext.id
  GROUP BY c2.name;

SELECT c2.id, c2.name as 'client', sum(if(value>20,1,0)) AS "conf30"
  FROM extension ext, client c1, client c2, extension_prefs exp
  WHERE ext.client_id = c1.id AND exp.param="conf_size"
   AND ext.type="conference"
   AND c1.parent_client_id = c2.id AND exp.extension_id = ext.id
  GROUP BY c2.name;
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