1 -it will be enough to setup the fuse @ __config _LP_OSC and to setup the programmer (melabs U2 Programmer ) to update by itself the "Configuration From File" ?....or i have to comment the *.inc file also?
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2A -how should i setup the TRISA.6 and TRISA.7 when the external crystal is used for sys clock
2B -what about if i will use internal osc (INTOSCIO) for sys clock and the external crystal for Timer1 ?
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3 -in the datasheet they say :"LP Oscillator mode selects the lowest gain setting of the internal inverter-amplifier. LP mode current consumption
is the least of the three modes. This mode is best suited to drive resonators with a low drive level specification, for example, tuning fork type crystals."

...they say "A series resistor (RS) may be required for quartz crystals with low drive level."
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.... so do you think i should add one resistor there ?

I saw the study case for pic16f690 and ext crystal ([HTML]http://ww1.microchip.com/downloads/en/AppNotes/91097A.pdf[/HTML])... should i go so deep ?

I have alot more questions, but tomorrow i have to go to work guys.

Thank You again for your patience.