CORP ACFT ON INITIAL CLB HAS ALTDEV AND WRONG FREQ.

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RETURN FLT YUM-PHX-YUM. DROPPED OFF PAX AT EXECUTIVE TERMINAL. CORPORATE OFFICER WENT ALONG FOR THE RIDE (UNINVITED) HOPING TO LOG SOME TIME IN A TWIN. IMPOSED SELF ON PF ON INITIAL TRIP YUM-PHX; HANDS AND FEET ON CTLS. ON LNDG SEQUENCE; PLT RPTING ASKED THIS PERSON TO KEEP CLR OF CTLS. RETURN FLT: RECEIVED CLRNC TO MAINTAIN RWY HDG SQUAWK XXXX DEP FREQ 124.1 MAINTAIN VFR AT 3000 FT. CORPORATE OFFICER'S HANDS ALL OVER THE PLACE; SETTING GND FREQ; ETC. SANDWICHED BTWN 2 JETS. PLT RPTING WATCHING FOR ROTATION POINT OF PRECEDING JET; CLRED INTO POS AND HOLD. CORPORATE OFFICER PLAYING WITH RADIOS GAVE ME THE IMPRESSION FREQ WERE SET UP AS HE WAS HOLDING THE TABLET CONTAINING DEP CLRNC. TWR CLRED MY ACFT FOR TKOF WITH 1 JET ON 4 MI FINAL. PWR; TKOF; RWY HDG; TURNED R HDG 150. LOOKED FOR TABLET; BUT BY THAT TIME IT WAS ON THE FLOOR NOWHERE TO BE SEEN. PUSHED ACFT OVER; LEVELED AT 3000 FT; SET 75 PERCENT PWR WHEN SENT TO DEP FREQ. TO MY HORROR; RADIO #2 SET TO GND FREQ. TO COMPLICATE MATTERS; XPONDER WAS IN STANDBY. WENT BACK TO TWR TO ASK FOR DEP FREQ (AFTER PLACING XPONDER ON). WHEN TWR ASKED WHAT ALT PLANE WAS AT; TO MY WORST HORROR I SAW ALT PLUS 200 FT AND PERSON ON R WITH HANDS ON WHEEL. I FELT LIKE A 40 HR PLT. AFTER BEING YELLED AT; WAS SENT TO DEP CTL WHO HAD A SOOTHING VOICE AND USHERED MY PLANE OUT OF THE AREA. LOTS OF ERRORS. NEVER THOUGHT I WOULD BE WRITING TO NASA. PROB: CORPORATE OFFICER INTERPOSING SELF ON PLT. WORST PROB: PLT DID NOT PUT THIS PERSON IN THE BACK SEAT; NOR DID HE [FAIL TO] HAVE A CLR UNDERSTANDING THAT THIS WAS NOT A TRAINING FLT. HOW DISCOVERED: ATC CAUGHT IT FIRST. CORRECTIVE ACTIONS: TRY TO SAVE THE SIT. TOTAL CORRECTIVE ACTION; RESOLVE NOT TO BE IN THIS SIT AGAIN. PERCEPTIONS: THIS OFFICER WAS A PLT; PIC SOMEHOW THOUGHT NOT TO TRIPLE-CHK WHAT HIS HANDS WERE ON. JUDGEMENT: POOR. ACTIONS: NO MORE PAX IN FRONT SEAT WITHOUT THOROUGH UNDERSTANDING ON ALL PARTIES CLARIFIED.