Yes, TBLMAX can be overriden using the FILE statement in the EZTPLS source library section. The maximum number of table entries is 32,767. Here is an example of the syntax that you may use:
FILE FILENAME FB (xxx,yyyy) TABLE nnnnn
TBLMAX is allowed but ignored in r11.x. This option was more useful with the 6.x series of compilers where tables were allocated up front and below the line. Table processing has been improved for r11.x, with tables now being allocated incrementally, as needed, and above the line. This has resulted in increased limits and better performance.