Hi Sylvain,
Tweaking theses can be useful especially tx-integer that influence both the spread of rach attemps and the delay between two attemps.
I like the idea of making this configurable, and yes our defaults are probably not all that great.
However, I think those parameters are inherently an attribute of the BTS, not the network.
So if you don't mind, please re-submit with adding the same data to the struct gsm_bts rather the struct gsm_network (and of course also move the vty parameters to the bts section).