signaling

Apologies if this has been addressed elsewhere, but a cursory search didn't turn anything up. Looks like the maximum number of systems per signaling type is four on the HT1250's. As the title states, wondering if there's any way to increase this limit? Particularly interested in adding several...

I have an Motorola xts 2500 model 3 conventional model! Im tryin to get the talk permit tone (like the Motorola chirp sound) Without using the astro signaling or trunking! Is there a way or hack or trick maybe with DTMF I want to press my PTT and here the chirp TPT tone