need Help in Timer...

Hi all,

I am using RTX 51 Tiny for my application. Currently my application using Two serial ports with two timers timer1 and timer2...as RTX uses timer 0 for timer ticks..is it possible to use Timer 0 interrupt...??? Am in need of timer to produce timeout.....but all timers are in use...

And kindly tell me saftey issues involved in RTX 51 tiny....