Hi, I'm not sure if it is easyeda or jlcpcb related. i'm designing flexible pcb with 6x force sensitive resistors for pcb assembly service.
Either looking for 2.54mm pitch connectors or want (if possible) sensors soldered to pcb. does anybody know if this is achievable, considering that fsr's are very hard to solder, just too fragile for most people. If I go for connectors, what would someone recommend for it? I thought about amphenol clincher type of connector. because of usage of this pcb and vibrations/ shocks, It have to hold sensors solid. 
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
"...for pcb assembly service."
By JLCPCB? Unlikely: see my comment at the end.
"Either looking for 2.54mm pitch connectors..."
What sort? There are thousands! Datasheets?
"or want (if possible) sensors soldered to pcb."
The flexi PCB?
"...does anybody know if this is achievable, considering that fsr's are very hard to solder, just too fragile for most people."
I once visited a factory in Japan where they hand soldered a something like 40 way plastic flexi PCB onto the glass plate of an assembled LCD by hand simply using an ordinary soldering iron slid quickly and very deftly along the pads!
"I thought about amphenol clincher type of connector."
Datasheet?
My comment at the end:
You may (or may not) find this topic helpful:
https://easyeda.com/forum/topic/How-to-specify-rigid-flex-regions-on-a-rigid-flex-PCB-84ae74c7808b4777abee6d4bed877e11