Alias for chained API calls?
I believe there is a notation for issuing multiple chains by appending ".2", ".3", etc. For example, in api/v3/examples/Contact/ChainTwoWebsites.php, it uses:

'api.website.create' =&gt; array(
  'url' =&gt; 'http://civicrm.org',
),
'api.website.create.2' =&gt; array(
  'url' =&gt; 'http://chained.org',
),


As far as I know, there is no way to do aliases.

Note: The class which handles chaining is ChainSubscriber. In skimming that code, I don't see anything which explicitly processes the ".2" suffix as a number. It would be worth a try to use a prettier/symbolic suffix (e.g. api.Contact.getsingle.self, api.Contact.getsingle.manager) -