I94 expires soon.L1A conversion filed-can i file Form I-539

[Spri]

All,

My current I94 will be expiring on 29th Apr.
My employer has already filed the L1A conversion (Current Visa is L1B individual)

My question
1. Can I file Form I-539 which is for an extension of stay?
Purpose of doing this is - I (My employer) will get the buffer time to respond RFE's if any OR to withdraw and resubmit the petition again.
2. Is there any specific reason like "Why I should not file Form I-539"
3. Is there any time line for this? (Should I apply this before my I94 expires?)

Thanks
SP.

[Spri]

Seniors experts,

any idea's?

I belive I-539 is meant only for spouse's of L1 etc....and the non-immigrant worker whould file only I 129 ..is that correct?

thanks in advance.Sp