GeoKen

My main goal is to get a field notes, not a log entry into GSAK.  I do all of my caching offline and I prefer  to write my log entries when I get home where I have a big screen and keyboard on my desktop computer and I and don't have to deal with the sun glare on my phone screen and I can use the publish logs features in GSAK.  I will publish a FTF log entry on my phone on FTFs as we have a lot of competition in my area for FTFs to alert other cachers that it was found.  This log entry will be something like "FTF more later" where I can generate a more appropriate log entry at home.
I also use field notes for creating notes on virtual & earthcaches as most of these requires one to gather information to be submitted later.
My workflow is as follows:
When I find a cache I make a field note about the cache that will remind me later on what it was.  A typical field not would be "Ammo can behind large boulder 10 feet off trail" or "HIde a Key in third Guard rail post, log sheet was saturated so I replaced it with a new one", etc. Also the date  and time is included in this field note.  These notes are not something I want to publish as log entries.
When I get home I upload all these field notes (one GPX export transfers all these notes to the GSAK user note section of each cache plus marks the cache as either found or DNF in my GSAK data base) and then I can use the publish logs function in GSAK to log all the caches.  I'll generate a template for the logs in GSAK and I can customize the log entry as these field note information is visible on the same screen to help jar my memory about the specifics of each cache.
After publishing the log entries to GC.com using GSAK I then transfer all my found cache from this database to a GSAK "Found" data base where I currently have a record of all the caches I have found.  I run another macro that transfer this information automatically to another program on my phone.  Now when I get the "Phone a Friend" call for help in locating a cache all I have to do is enter a GC code or a partial name of the cache they are looking for and I instantly get the date I found it, the time I found it, and the field note cache details on the specific cache they are looking for.  I have the process of getting this information into my phone automated as long as I have my field note in the GSAK user note section.
I find this process works very well for multi day trips where cache logging can not take place every day.  I just do a field note GPX file export at the end of each day to my drop box account and now I have one GPX file for each day of caching that I will load in GSAK database files I call day1, day2, etc.  The advantage of using GPX files over text files is I don't have to have any prior cache information in the specific GSAK database file as all information about the cache is embedded in the GPX fie.
Sorry for the long answer to your question but I thought it might help to understand my workflow as to why I am looking for this feature.

Is it possible to have a template for the cache note section like the log template.  I like to preference my cache note with a date and time stamp.  I see the log note supports this but I don't see it for the cache note.

I would think a simple insert feature would work here. Such as an option to insert the current date, your username, etc etc. Keywords wouldn't work since they would need to be replaced before synching with geocaching.com.