Procedure cache (plan cache) size I'm developing an application with many, dinamycally-assembled, complicated SQL queries. I'd like to keep the query plans in the procedure cache for as long as it is possible. To prevent discarding the query plans from the procedure cache (because of memory pressure), I'd like to allocate enough memory to the procedure cache. According to this only 10% of the "visible target" memory in the 4Gb-64GB range is used for the procedure cache; I'd like this rate to be higher.

Is there any way to have some control on the size of the procedure cache? SQL Server 2008 or 2012; maybe some Enterprise Edition features?

Also, does this "10% of the visible target memory" rule also apply, if I explicitly set the min. memory for the SQL Server?

(I am aware of the KEEP PLAN / KEEPFIXED PLAN hints; I'm also aware of the advatages of preparing the statements over ad-hoc queries, so please don't recommend these possibilities. I'm specifically curious about controlling the procedure cache size.)
You can't control plan cache size manually. The following Connect item describes both the fact that they won't be adding a knob any time soon and also that Resource Governor might be marginally useful in a few narrow use cases:

http://connect.microsoft.com/SQLServer/feedback/details/293188/amount-of-ram-for-procedure-cache-should-be-configurable

However, as I've alluded to in the comments, there are other ways you can make the plan cache more effective (e.g. use the "optimize for ad hoc workloads" setting). Kimberly explains this in greater detail, but essentially, this setting places much smaller stubs in the cache until the same plan is used more than once, and only then does it cache the whole thing. Under the default configuration, and especially in cases where a lot of dynamically assembled SQL is in place, single-use plans often waste a lot of space in the cache. If you reduce the amount of wasted space these occupy, you leave more room for plans that are used more than once, and those are precisely the ones you want to keep around anyway.