Pillar/foundation spam is one of the top 3 Ark gripes from every player. My suggestion is to Give every player claim flags. Tribe leaders get a "Large" flag for main base and each tribe member get two small flags for things like minibase, traps etc. You will not be able to place these flags if you already have them down. Picking up the flag add a 12 hour timer to any stuctures that where built in it's zone. Large claim flags are 30-50 foundations wide/long buildable area, small are 15-20 foundations. Devs have unlimited small claim flags they can place on major resource nodes or no build areas like caves. Only the player who placed the flag and tribe leader can removed the flags.
For launch day servers being full my suggestion is to set a 4 hour limit with 10min. warnings the last 30 min. After the servers hit 55 or less average players the limit is lifted. If the servers hit 60/70 average for 3 days in a row the limit is placed again. Also adding an afk warning for players who havent moved for more than 15min. After 5 more min. they are logged out.