You're aware that you can create an "object" that reproduces any SEARCH or TUNE mode configuration, right? Then sit on that object in MAN mode (or even SCAN through several of them), getting your backlight/LED indications when something is found.
The only thing that TUNE mode does for you that a "SRCH object" won't is decoding of trunking control channels when found.
For example, if I wanted to look for new frequencies between 451.000 and 488.000 MHz, and get a "backlight alert" when the scanner found something, I'd:
PGM NEW SRCH LMIT
FrLo = 451.000
FrHi = 488.000
Backlight = On
(maybe change alpha tag, scan list membership, etc., but not required)
F1 (Save)
MAN
F1 (SRCH)
If this doesn't do what you want, why not?