1.- The click and play is for RunUO 2.2 only. RunUO SVN added a lot of changes over 2.2. If want to use a continuous updated RunUO so use RunUO SVN and install distro 67 in it. Maybe you will be capable to update it by tortoise, but not good idea in a running shard, because sometimes RunUO SVN will update files that will change Nerun's Distro files and will disable something. The better option is update anoter folder with SVN, and check the changelog, verify wich files had been changed, and copy/paste them in your shard folder.
2.- I never look at OrbSA in depth. But i know it uses RunUO SVN 766. RunUO SVN is now at 825, it's a few outdated so, but more updated that 2.2. SA features in Ultima Online are good adds. OrbSA surely not completed. If you plan to use this code, check at Obsydia foruns what effectively has changed/added to RunUO, so you can know what you can make "enable" or "ON" in your shard. Some players will not like a shard with only 50% SA implemented, but must of them will see no problem in enter a dungeon without quests, but only new mobs.
Test everything, every new quest, dungeon etc (of SA) before open it to public, so you will get no surprises.