choice values from table?

Not using the mulitple choice "field" type.  You would need to create a relationship between two tables. 

Are you looking for something like this?  Master Row in Table 1 linked to multiple keywords ? 

Create an association table between Table 1 and Keywords. 

Sure..  http://mconneen.infointegrators.net/ninox/Keyword.ninox 

I am not following 100%...  Here is a "view" that searches by key word and display's the Table 1 row text.. 

You can also configure the Keyword Association view on the Keyword table to show the Table 1 text. 

To populate the Table 1 row with "Keyword" .. .you can also add a search of the keyword table and populate build the keyword association via code snippet in an after update trigger..   There are other threads in this forum that outline that approach.. 

@joh85

For #1 above... there is a more elegant / user friendly way to make these connections other than they way I displayed (which is pretty much "out of the box").   You still have to add them one by one.. but it is pretty easy.. See this thread for an excellent discussion  with a few lines of code.. it is very easy.... 
https://ninoxdb.de/en/forum/technical-help-5ab8fe445fe2b42b7dd39ee7/search-bar-with-button-5b74ecfd9efc8227533e7d42

For #2.. Yes assuming you are going you have hundreds of keywords / index words in a spreadsheet.. You can import those into a table to manage... and then tag to each film using the approach described in #1 above.  You still will have to add them keyword by keyword.. ..  but I only know that one requirement.. manage a single list..   I suspect your "keywords" may actually have some sort of hierarchy.. 

For #3.. you are on the right track... you can either use a view as I previously displayed ... and add numerous columns.. which I suggest its not user friendly.. or you can create multiple table views on the Keyword Association Table and filter by Keyword.   For each desired view.. click on a header row, then select "Show Column".. If you want to see more of "Table 1"'s columns.. click on Table 1.. and add it's columns. 

Once you have #1 working the way you like it... and #3 somewhat configured with a view or two...   You may find it annoying to keep right clicking and manipulating the keyword filter...  SOOO.. the next iteration will be to add a "In Scop" formula field that references the "Search Keyword" table/form .. and returns "true" if it is within view...  That is a bit more code .. and a bit more complex.. so tackle the above first.. then we can start a different forum thread to gather ideas on how other's apply complex filtering.. or perhaps see if Julian or NinuxUS have a prebuilt tutorial / webinar on complex filtering / data visualization techniques.. :) 

I think fundamentally, ninox needs an augmented choice field that derives its source from a data select string, and returns 1 or many Id's of selected records.  This will enable many nuanced workflows.

....funny, it is now 11 months later, and i return to Ninox to give it another shot, and run into the same basic issue that fundamentally makes me cringe.  Case in point: designing a data-driven accounting system, embedding system knowledge into tables (as ninox doesn't truly support any global value structs), whereby i can define GL Type as Debit=1, Credit=-1 to allow for easy and automatic table-level signed summation enhancements and NOT have to redefine this at various points.  I could then assign one field to this table (of two records), and *wishfully* have it display as a dropdown-based CHOICE, which would store the value field in each accordingly.  

For now, back to hacking what should be centralized, into various screens.