frame sending time and delayMicroseconds

[WeareGermans]

Hi,

i am using v0.5-FrSky, 06-11-2013.

Is it necessary to send the FrSky Frames together?
Can i send them to odd times that the chance of sending all frames at the same time gets reduced, or will i run in some troubles with the receiver if let's say Frame 3 is sent without Frame 1 prior?

what is the delayMicroseconds(138); in Mavlink.ino for? Is it really neccessary or can it at lease be reduced?

I am trying to combine this code with neopixels and am running in timing issues with the current code.
Since blinking with switching times unter 100ms is unreliable.

Thanks for the help!