I am a bit confused on this site. I haven't mined in a very long time; the last time I was mining was when I was one of the unlucky few to be scammed by KNC Miner for their Titan miners.
Questions is, is stratum+tcp:// used for script SHA256 mining or is also used for other coins like LTC?
Other than BTC and BCH are there any other pools on this site that use SHA256?
I'm also confused about your question but if you are using viabtc pool it is required and stratum+tcp is included not only LTC but any coins supported by Viabtc.
Maybe what you want to ask is that using stratum+tcp you can maybe able to mine other coins like LTC? Isn't that your question?
Anyway, if your ASIC miner is only support Sha256 then you can only mine Bitcoin or other sha256 coins not LTC.
About the 2nd question you can't find other pools on Viabtc if you are looking for other pools that can mine other coins that support sha256 algo then check this tool below.
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https://miningpoolstats.stream/