Using same button for entering/exiting some part of code?

[tumbleweed]

what about something like this instead?

IF UPBT=0 THEN
    MENUITEM=MENUITEM+1
    IF MENUITEM>6 THEN MENUITEM=1
    PAUSE 20
    WHILE UPBT=0:WEND 
    PAUSE 20
ENDIF

IF DNBT=0 THEN
    MENUITEM=MENUITEM-1
    IF MENUITEM<1 THEN MENUITEM=6
    PAUSE 20
    WHILE DNBT=0:WEND
    PAUSE 20
ENDIF

IF LBUT=0 THEN
    IF MENUITEM=1 THEN  
        TVE=TVE+1
        IF TVE>13 THEN TVE=1
        GOSUB SETTIME
    ENDIF
    IF MENUITEM=2 THEN  
        RICXVI=RICXVI+1
        IF RICXVI>31 THEN RICXVI=1
        GOSUB SETTIME
    ENDIF
    IF MENUITEM=3 THEN  
        DGE=DGE+1
        IF DGE>7 THEN DGE=1
        GOSUB SETTIME
    ENDIF
    
    PAUSE 20
    WHILE LBUT=0:WEND 
    PAUSE 20
ENDIF

IF RBUT=0 THEN
    IF MENUITEM=1 THEN  
        TVE=TVE-1
        IF TVE<1 THEN TVE=13
        GOSUB SETTIME
    ENDIF
    IF MENUITEM=2 THEN  
        RICXVI=RICXVI-1
        IF RICXVI<1 THEN RICXVI=31
        GOSUB SETTIME
    ENDIF
    IF MENUITEM=3 THEN  
        DGE=DGE-1
        IF DGE<1 THEN DGE=7
        GOSUB SETTIME
    ENDIF
    
    PAUSE 20
    WHILE RBUT=0:WEND 
    PAUSE 20
ENDIF

it could be simplified even more, but...