Hey, thanks for the reply (neat vid, by the way)! I suspected as much; there's quite a bit going on in the .scn files. I had a fleeting thought that it would be as simple as picking up post-DOI and punching some new coordinates into the DSKY before P63 or something, but if that were the case, then keeping the mid-mission scenarios updated wouldn't be quite so onerous now that I think about it.
The AGC absolutely lets you change the targeted landing site after DOI. But you are fairly constraint in your choice. The maximum recommended crossrange for PDI is 8 nautical miles, so you can't deviate much from your current orbit to the north or south. And in the downrange direction you are constraint by the altitude at PDI. Normally after DOI you have a 60NM apolune and 50,000 feet perilune orbit, with PDI planned at perilune. If you want to land further west or east you won't be at perilune for PDI. But this isn't a very hard constraint, you can certainly land +/- 100 NM downrange from the targeted landing site.
The main method of calculating all sorts of things for NASSP is the RTCC MFD, which is part of the NASSP releases. It should have everything you need to get you into the right position for PDI: calculations for midcourse corrections, lunar orbit insertion, descent orbit insertion and much more. You can find the manual in the NASSP releases under "Doc\Project Apollo - NASSP\Programmers Notes\ApolloRTCCMFD.pdf" The manual is a bit outdated, it covers the state of the MFD when NASSP 7.0 was released 10 months ago, so it is missing some important parts about DOI, PDI etc. But you might be able to click yourself through the MFD and figure out those features of the MFD without the help of the manual. The MFD has prepopulated numbers for most lunar landing missions. So if you e.g. load the MFD in an Apollo 11 scenario, it already has the Apollo 11 landing site saved as a mission constant.
Also helpful for new-ish users is the Checklist MFD. For Apollo 7-11 it already covers the whole mission, so it basically is a switch-by-switch guide for complete missions. It doesn't teach you anything about spacecraft systems etc. but it can help with not making too many user errors.
I'll probably mess with some launch scenarios and trajectory planning in 2010/2016, then. Any recommended reading materials for this? I reckon some of the original mission planning documents off ALSJ might be useful, but is there anything NASSP/Virtual AGC-specific you'd recommend? Thanks!
In terms of mission documentation there luckily is a lot available. The AFJ and ALSJ have many of the flight plans and checklists, just check the pages for a specific mission. NASSP has some generic checklists under "Doc\Project Apollo - NASSP\Word Checklists", but I always prefer to use the flown, mission specific checklists whenever they are available. The Apollo Operations Handbook for CSM (
https://history.nasa.gov/afj/aohindex.html) and LM (
https://www.hq.nasa.gov/alsj/LM10HandbookVol1.pdf) are also good reading material.