Multiple caching with different cache lifetime at one page

Hi all,

Well I have seen technical note in the manual:

Technical Note: If you want to give certain templates their own cache lifeti
me, you could do
this by setting $caching = 2, then set $cache_lifetime to a unique value jus
t before calling
display() or fetch().

Is it possible to set $cache_lifetime dinamicaly on the template for example
 pseudo code:

index.tpl
----------------------------------------------
// set $cache_lifetime = 10000;
{include file="header.tpl" }
// set $cache_lifetime = 30;
{include file="banner.tpl" }
// set $cache_lifetime = 1800 + $randommnes;
{include file="content.tpl" }
// set $cache_lifetime = 10000;
{include file="footer.tpl" }